diff --git a/html/index.html b/html/index.html
index d332e55..39b8809 100644
--- a/html/index.html
+++ b/html/index.html
@@ -4,263 +4,442 @@
     <meta charset="utf-8">
     <title>Pixelserver Interface</title>
 
-    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=1, viewport-fit=auto"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no, viewport-fit=cover"/>
     <link rel="apple-touch-icon" sizes="180x180" href="/icons/apple-touch-icon.png">
     <link rel="icon" type="image/png" sizes="32x32" href="/icons/favicon-32x32.png">
     <link rel="icon" type="image/png" sizes="16x16" href="/icons/favicon-16x16.png">
     <link rel="manifest" href="/site.webmanifest">
 
     <style>
+        /* --- Base Styles & CSS Variables --- */
+        :root {
+            --bg-color: #f7fafc;
+            --card-bg-color: #ffffff;
+            --text-color: #2d3748;
+            --header-color: #1a202c;
+            --muted-text-color: #718096;
+            --border-color: #e2e8f0;
+            --input-bg-color: #f7fafc;
+            --button-primary-bg: #3b82f6;
+            --button-primary-hover-bg: #2563eb;
+            --button-secondary-bg: #6b7280;
+            --button-secondary-hover-bg: #4b5563;
+            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
+        }
+
+        @media (prefers-color-scheme: dark) {
+            :root {
+                --bg-color: #111827;
+                --card-bg-color: #1f2937;
+                --text-color: #d1d5db;
+                --header-color: #ffffff;
+                --muted-text-color: #9ca3af;
+                --border-color: #374151;
+                --input-bg-color: #374151;
+                --button-secondary-bg: #4b5563;
+                --button-secondary-hover-bg: #374151;
+            }
+        }
+
+        body {
+            margin: 0;
+            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            background-color: var(--bg-color);
+            color: var(--text-color);
+            padding: 1rem;
+            box-sizing: border-box;
+        }
+
+        /* --- Layout --- */
+        .main-container {
+            max-width: 1400px;
+            margin: 0 auto;
+        }
+
         .main {
-            display: grid;
-            grid-gap: 1rem;
-            align-items: stretch;
+            display: flex;
+            flex-wrap: wrap;
+            gap: 1.5rem;
+            justify-content: center;
         }
 
-        @media only screen {
-            .main {
-                grid-template-columns: repeat(1, 1fr);
-            }
-        }
-
-        @media only screen and (min-width: 800px) {
-            .main {
-                grid-template-columns: repeat(2, 1fr);
-            }
-        }
-
-        @media only screen and (min-width: 1111px) {
-            .main {
-                grid-template-columns: repeat(3, 1fr);
-            }
-        }
-
-
         .col {
+            background-color: var(--card-bg-color);
+            border-radius: 0.75rem;
+            padding: 1.5rem;
+            box-shadow: var(--shadow-md);
+            border: 1px solid var(--border-color);
+            flex: 1 1 320px; /* Flex-grow, flex-shrink, basis */
             min-width: 300px;
-            /*max-width: 350px;*/
-        }
-
-        .just, .just-col {
             display: flex;
-        }
-
-        .just > * {
-            flex: 1;
-            margin: 0 1rem;
-        }
-
-        .just-col {
             flex-direction: column;
         }
 
-        .just-col > * {
-            flex: 1;
-            margin: 2px 1rem;
+        /* --- Typography --- */
+        h1 {
+            text-align: center;
+            color: var(--header-color);
+            margin-bottom: 2rem;
+            font-size: 2.25rem;
+        }
+
+        h1 i {
+            font-style: normal;
+            color: var(--button-primary-bg);
+        }
+
+        h2 {
+            font-size: 1.25rem;
+            color: var(--header-color);
+            border-bottom: 1px solid var(--border-color);
+            padding-bottom: 0.5rem;
+            margin-top: 0;
+            margin-bottom: 1rem;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
+
+        h3 {
+            color: var(--header-color);
+            margin-top: 0.5rem;
+            margin-bottom: 0;
+            font-size: 1rem;
+        }
+
+        label {
+            display: block;
+            /*margin-top: 0.5rem;*/
+            font-weight: 500;
+        }
+
+        /* --- Forms & Inputs --- */
+        form {
+            display: flex;
+            flex-direction: column;
+            gap: 1rem;
+            flex-grow: 1; /* Allow form to grow */
+        }
+
+        input[type="text"],
+        input[type="number"],
+        select {
+            width: 100%;
+            padding: 0.75rem;
+            border-radius: 0.375rem;
+            border: 1px solid var(--border-color);
+            background-color: var(--input-bg-color);
+            color: var(--text-color);
+            box-sizing: border-box;
+            font-size: 1rem;
+        }
+
+        input[type="checkbox"] {
+            /* Hide original checkbox */
+            display: none;
+        }
+
+        button {
+            padding: 0.75rem 1.5rem;
+            border: none;
+            border-radius: 0.375rem;
+            background-color: var(--button-primary-bg);
+            color: white;
+            font-weight: 600;
+            font-size: 1rem;
+            cursor: pointer;
+            transition: background-color 0.2s ease;
+        }
+
+        button:hover {
+            background-color: var(--button-primary-hover-bg);
+        }
+
+        button.startstop {
+            padding: 0.25rem 0.75rem;
+            font-size: 0.875rem;
+            font-weight: 500;
+            background-color: var(--button-secondary-bg);
+        }
+
+        button.startstop:hover {
+            background-color: var(--button-secondary-hover-bg);
+        }
+
+        textarea {
+            width: 100%;
+            box-sizing: border-box;
+            height: 300px;
+            background-color: var(--input-bg-color);
+            color: var(--text-color);
+            border: 1px solid var(--border-color);
+            border-radius: 0.375rem;
+            padding: 0.5rem;
+            font-family: monospace;
+            flex-grow: 1;
+        }
+
+        /* --- Helper classes --- */
+        .just-col {
+            display: flex;
+            flex-direction: column;
+            gap: 1rem;
+            align-items: stretch;
+        }
+
+        .just-col label {
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            gap: 1rem;
         }
 
         #gammaform span {
-            display: inline-block;
-            width: 4rem;
+            flex-basis: 4rem;
+            flex-shrink: 0;
         }
 
-        .logging {
-            max-width: 500px;
+        /* --- Button Checkbox Styles --- */
+        .checkbox-button {
+            display: block;
+            padding: 0.75rem 1rem;
+            border: 5px solid var(--border-color);
+            border-radius: 0.375rem;
+            text-align: center;
+            cursor: pointer;
+            background-color: var(--card-bg-color);
+            color: var(--text-color);
+            transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
+            font-weight: 500;
         }
 
-        .options {
-            max-width: 350px;
+        #flipform input[type="checkbox"]:checked + .checkbox-button {
+            /*background-color: var(--button-primary-bg);*/
+            /*color: white;*/
+            border-color: var(--button-primary-bg);
+            border-width: 5px;
         }
     </style>
 </head>
 <body>
-<h1 style="text-align: center;">Andreas <i>production-ready</i> Interface</h1>
-<div class="main">
-    <div class="col">
-        <h2><label for="list">Kommando:</label></h2>
-        <form id="in" class="" onSubmit="return request()">
-            <select id="list"></select>
-            <input id="args"/>
-            <button id="execute">Ausführen</button>
-        </form>
+<div class="main-container">
+    <h1>Andreas <i>production-ready</i> Interface</h1>
+    <div class="main">
+        <div class="col">
+            <h2>Kommando</h2>
+            <form id="in" onSubmit="return request()">
+                <select id="list"></select>
+                <input id="args" type="text" placeholder="Argumente..."/>
+                <button>Ausführen</button>
+            </form>
+        </div>
 
-        <h2><label for="brightness">Intensität:</label></h2>
-        <form id="brightnessform" class="just" onSubmit="return setbrightness()">
-            <input id="brightness" value="1.0"><br/>
-            <button id="sendbrightness">Setzen</button>
-        </form>
+        <div class="col">
+            <h2>Intensität</h2>
+            <form onSubmit="return setbrightness()">
+                <input id="brightness" value="1.0" type="number" step="0.1"><br/>
+                <button>Setzen</button>
+            </form>
+        </div>
+
+        <div class="col">
+            <h2>Gamma</h2>
+            <form id="gammaform" class="just-col" onSubmit="return setgamma()">
+                <label><span>Rot: </span><input id="gammar" value="2.8" type="number" step="0.05"/></label>
+                <label><span>Grün: </span><input id="gammag" value="2.65" type="number" step="0.05"/></label>
+                <label><span>Blau: </span><input id="gammab" value="2.65" type="number" step="0.05"/></label>
+                <label><span>Weiß: </span><input id="gammaw" value="2.65" type="number" step="0.05"/></label>
+                <button>Setzen</button>
+            </form>
+        </div>
+
+        <div class="col">
+            <h2>Flip</h2>
+            <form id="flipform" onSubmit="return setFlip()">
+                <label>
+                    <input id="flipx" type="checkbox"/>
+                    <span class="checkbox-button">Flip X</span>
+                </label>
+                <label>
+                    <input id="flipy" type="checkbox"/>
+                    <span class="checkbox-button">Flip Y</span>
+                </label>
+                <button>Setzen</button>
+            </form>
+        </div>
+
+        <div class="col">
+            <h2>Filter</h2>
+            <form onSubmit="return setFilter()">
+                <h3><label for="filtername">Filterimage:</label></h3>
+                <input id="filtername" value="test" type="text">
+                <button>Setzen</button>
+            </form>
+            <form onSubmit="return setFilterExpr()">
+                <h3><label for="filterexpr">Filter expression:</label></h3>
+                <input id="filterexpr" value="0.5+0.25*sin(x/3+t)" type="text">
+                <button>Setzen</button>
+            </form>
+        </div>
+
+        <div class="col">
+            <h2>Crash Log
+                <button id="crashlogbtn" class="startstop" type="button" onclick="return enableCrashLog()">start</button>
+            </h2>
+            <textarea readonly id="crashlogs" style="display: none;"></textarea>
+        </div>
+
+        <div class="col">
+            <h2>Log
+                <button id="logbtn" class="startstop" type="button" onclick="return enableLog()">start</button>
+            </h2>
+            <textarea readonly id="logs" style="display: none;"></textarea>
+        </div>
     </div>
-    <div class="options col">
-        <h2>Gamma:</h2>
-        <form id="gammaform" class="just-col" onSubmit="return setgamma()">
-            <label><span>Rot: </span><input id="gammar" value="2.8"/></label><br/>
-            <label><span>Grün: </span><input id="gammag" value="2.65"/></label><br/>
-            <label><span>Blau: </span><input id="gammab" value="2.65"/></label><br/>
-            <label><span>Weiß: </span><input id="gammaw" value="2.65"/></label><br/>
-            <button id="sendgamma">Setzen</button>
-        </form>
-
-        <h2>Flip:</h2>
-        <form id="flipform" class="just" onSubmit="return setFlip()">
-            <label><input id="flipx" type="checkbox"/> Flip X</label>
-            <label><input id="flipy" type="checkbox"/> Flip Y</label>
-            <button id="sendflip">Setzen</button>
-        </form>
-
-        <h2><label for="filtername">Filterimage:</label></h2>
-        <form id="filterform" class="just" onSubmit="return setFilter()">
-            <input id="filtername" value="test">
-            <button id="filterflip">Setzen</button>
-        </form>
-
-        <h2><label for="filterexpr">Filter expression:</label></h2>
-        <form id="filterexprform" class="just" onSubmit="return setFilterExpr()">
-            <input id="filterexpr" value="0.5+0.25*sin(x/3+t)">
-            <button>Setzen</button>
-        </form>
-    </div>
-    <div class="logging col">
-        <h2>Crash Log:
-            <button id="crashlogbtn" type="button" onclick="return enableCrashLog()">start</button>
-        </h2>
-        <textarea readonly id="crashlogs" style="width: 500px; height: 300px; display: none;"></textarea>
-
-        <h2>Log:
-            <button id="logbtn" type="button" onclick="return enableLog()">start</button>
-        </h2>
-        <textarea readonly id="logs" style="width: 500px; height: 300px; display: none;"></textarea>
-    </div>
-    <script>
-        function getRaw(url, callback) {
-            const xhttp = new XMLHttpRequest();
-            xhttp.onreadystatechange = function () {
-                if (this.readyState === 4 && this.status === 200)
-                    if (callback) callback(xhttp.responseText);
-            };
-            xhttp.open("GET", url, true);
-            xhttp.send();
-        }
-
-        function getJSON(url, callback) {
-            getRaw(url, function (text) {
-                callback(JSON.parse(text));
-            });
-        }
-
-        function post(url, data) {
-            const formdata = new FormData();
-            for (const key in data)
-                formdata.append(key, data[key]);
-
-            const xhttp = new XMLHttpRequest();
-            // xhttp.onreadystatechange = function () {
-            //     if (this.readyState === 4 && this.status === 200) {}
-            // };
-            xhttp.open("POST", url, true);
-            xhttp.send(formdata);
-        }
-
-        function populateForm(parameters) {
-            const list = document.getElementById("list");
-
-            for (const i in parameters) {
-                const app = parameters[i];
-                const name = app["name"];
-                const guiname = app["guiname"];
-                const persistent = app["persistent"];
-                const element = document.createElement("option");
-                element.value = name;
-                element.innerHTML = guiname;
-                element.dataset.persistent = persistent;
-                list.appendChild(element);
-            }
-
-            list.onchange = function () {
-                const app = document.getElementById('list');
-                const persistent = app.options[app.selectedIndex].dataset.persistent;
-                if (persistent == "true") {
-                    document.getElementById("args").style.display = "none";
-                } else {
-                    document.getElementById("args").style.display = "inline";
-                }
-            };
-            list.onchange();
-            document.getElementById("container").style.display = "block";
-        }
-
-        function request() {
-            let app = document.getElementById('list');
-            let val = app.options[app.selectedIndex].value;
-            let parameter = document.getElementById('args').value;
-            post("/apps/start/" + val, {"param": parameter});
-            return false;
-        }
-
-        function setgamma() {
-            const r = document.getElementById('gammar').value;
-            const g = document.getElementById('gammag').value;
-            const b = document.getElementById('gammab').value;
-            const w = document.getElementById('gammaw').value;
-            getRaw(`/setgamma/${r}/${g}/${b}/${w}`);
-            return false;
-        }
-
-        function setbrightness() {
-            const i = document.getElementById('brightness').value;
-            getRaw("/setbrightness/" + i);
-            return false;
-        }
-
-        function setFlip() {
-            const x = document.getElementById('flipx').checked;
-            const y = document.getElementById('flipy').checked;
-            getRaw("/filter/flipx/" + x);
-            getRaw("/filter/flipy/" + y);
-            return false;
-        }
-
-        function setFilter() {
-            const i = document.getElementById('filtername').value;
-            getRaw("/filter/img/" + i);
-            return false;
-        }
-
-        function setFilterExpr() {
-            const expr = document.getElementById('filterexpr').value;
-            post("/filter/expr/", {"expr": expr});
-            return false;
-        }
-
-        function updateLog() {
-            getRaw("/apps/log", function (text) {
-                document.getElementById('logs').value = text;
-            });
-        }
-
-        function updateCrashLog() {
-            getRaw("/apps/crashlog", function (text) {
-                document.getElementById('crashlogs').value = text;
-            });
-        }
-
-        function enableCrashLog() {
-            document.getElementById("crashlogbtn").remove();
-            document.getElementById("crashlogs").style.display = "block";
-            updateCrashLog();
-            setInterval(updateCrashLog, 1000);
-            return false;
-        }
-
-        function enableLog() {
-            document.getElementById("logbtn").remove();
-            document.getElementById("logs").style.display = "block";
-            updateLog();
-            setInterval(updateLog, 1000);
-            return false;
-        }
-
-        getJSON("/apps/list", populateForm);
-    </script>
 </div>
+<script>
+    function getRaw(url, callback) {
+        const xhttp = new XMLHttpRequest();
+        xhttp.onreadystatechange = function () {
+            if (this.readyState === 4 && this.status === 200)
+                if (callback) callback(xhttp.responseText);
+        };
+        xhttp.open("GET", url, true);
+        xhttp.send();
+    }
+
+    function getJSON(url, callback) {
+        getRaw(url, function (text) {
+            callback(JSON.parse(text));
+        });
+    }
+
+    function post(url, data) {
+        const formdata = new FormData();
+        for (const key in data)
+            formdata.append(key, data[key]);
+
+        const xhttp = new XMLHttpRequest();
+        // xhttp.onreadystatechange = function () {
+        //     if (this.readyState === 4 && this.status === 200) {}
+        // };
+        xhttp.open("POST", url, true);
+        xhttp.send(formdata);
+    }
+
+    function populateForm(parameters) {
+        const list = document.getElementById("list");
+
+        for (const i in parameters) {
+            const app = parameters[i];
+            const name = app["name"];
+            const guiname = app["guiname"];
+            const persistent = app["persistent"];
+            const element = document.createElement("option");
+            element.value = name;
+            element.innerHTML = guiname;
+            element.dataset.persistent = persistent;
+            list.appendChild(element);
+        }
+
+        list.onchange = function () {
+            const app = document.getElementById('list');
+            const persistent = app.options[app.selectedIndex].dataset.persistent;
+            if (persistent == "true") {
+                document.getElementById("args").style.display = "none";
+            } else {
+                document.getElementById("args").style.display = "inline";
+            }
+        };
+        list.onchange();
+    }
+
+    function request() {
+        let app = document.getElementById('list');
+        let val = app.options[app.selectedIndex].value;
+        let parameter = document.getElementById('args').value;
+        post("/apps/start/" + val, {"param": parameter});
+        return false;
+    }
+
+    function setgamma() {
+        const r = document.getElementById('gammar').value;
+        const g = document.getElementById('gammag').value;
+        const b = document.getElementById('gammab').value;
+        const w = document.getElementById('gammaw').value;
+        getRaw(`/setgamma/${r}/${g}/${b}/${w}`);
+        return false;
+    }
+
+    function setbrightness() {
+        const i = document.getElementById('brightness').value;
+        getRaw("/setbrightness/" + i);
+        return false;
+    }
+
+    function setFlip() {
+        const x = document.getElementById('flipx').checked;
+        const y = document.getElementById('flipy').checked;
+        getRaw("/filter/flipx/" + x);
+        getRaw("/filter/flipy/" + y);
+        return false;
+    }
+
+    function setFilter() {
+        const i = document.getElementById('filtername').value;
+        getRaw("/filter/img/" + i);
+        return false;
+    }
+
+    function setFilterExpr() {
+        const expr = document.getElementById('filterexpr').value;
+        post("/filter/expr/", {"expr": expr});
+        return false;
+    }
+
+    function updateLog() {
+        getRaw("/apps/log", function (text) {
+            document.getElementById('logs').value = text;
+        });
+    }
+
+    function updateCrashLog() {
+        getRaw("/apps/crashlog", function (text) {
+            document.getElementById('crashlogs').value = text;
+        });
+    }
+
+    function enableCrashLog() {
+        const logArea = document.getElementById('crashlogs');
+        const btn = document.getElementById('crashlogbtn');
+        const isHidden = logArea.style.display === 'none';
+        logArea.style.display = isHidden ? 'block' : 'none';
+        btn.textContent = isHidden ? 'stop' : 'start';
+
+        clearInterval(window.crash_interval);
+        if (isHidden) {
+            updateCrashLog();
+            window.crash_interval = setInterval(updateCrashLog, 1000);
+        }
+        return false;
+    }
+
+    function enableLog() {
+        const logArea = document.getElementById('logs');
+        const btn = document.getElementById('logbtn');
+        const isHidden = logArea.style.display === 'none';
+        logArea.style.display = isHidden ? 'block' : 'none';
+        btn.textContent = isHidden ? 'stop' : 'start';
+
+        clearInterval(window.log_interval);
+        if (isHidden) {
+            updateLog();
+            window.log_interval = setInterval(updateLog, 1000);
+        }
+        return false;
+    }
+
+    getJSON("/apps/list", populateForm);
+</script>
 </body>
 </html>