diff --git a/.well-known/security.txt b/.well-known/security.txt
index aae19ef..a8e3b12 100644
--- a/.well-known/security.txt
+++ b/.well-known/security.txt
@@ -1,3 +1,2 @@
 Contact: mailto:noc [at] this domain
-Announcements: https://twitter.com/chaospott_noc/
 Announcements: https://chaos.social/@chaospott_noc
diff --git a/_sass/_base.scss b/_sass/_base.scss
index 59e1cfe..40a1991 100644
--- a/_sass/_base.scss
+++ b/_sass/_base.scss
@@ -55,7 +55,7 @@ ol,
 dl,
 figure,
 %vertical-rhythm {
-    margin-bottom: $spacing-unit / 2;
+    margin-bottom: calc($spacing-unit / 2);
 }
 
 
@@ -137,7 +137,7 @@ a {
 blockquote {
     color: $grey-color;
     border-left: 4px solid $grey-color-light;
-    padding-left: $spacing-unit / 2;
+    padding-left: calc($spacing-unit / 2);
     font-size: 18px;
     letter-spacing: -1px;
     font-style: italic;
@@ -189,8 +189,8 @@ pre {
     @include media-query($on-laptop) {
         max-width: -webkit-calc(800px - (#{$spacing-unit}));
         max-width : calc(800px - (#{$spacing-unit}));
-        padding-right: $spacing-unit / 2;
-        padding-left: $spacing-unit / 2;
+        padding-right: calc($spacing-unit / 2);
+        padding-left: calc($spacing-unit / 2);
     }
 }
 
@@ -222,4 +222,4 @@ pre {
             fill: $grey-color;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/_sass/_chaospott.scss b/_sass/_chaospott.scss
index 746dc89..22d9d4c 100644
--- a/_sass/_chaospott.scss
+++ b/_sass/_chaospott.scss
@@ -40,7 +40,7 @@ body {
   /*box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);*/
   .divider-vertical {
     height: 20px;
-    margin: 14px 9px;
+    margin: 14px 10px;
     border-right: 1px solid $nav-link-color;
     border-left: 1px solid $nav-link-color;
   }
diff --git a/_sass/_layout.scss b/_sass/_layout.scss
index def56f8..fce9eba 100644
--- a/_sass/_layout.scss
+++ b/_sass/_layout.scss
@@ -98,7 +98,7 @@
 
 .footer-heading {
     font-size: 18px;
-    margin-bottom: $spacing-unit / 2;
+    margin-bottom: calc($spacing-unit / 2);
 }
 
 .contact-list,
@@ -110,14 +110,14 @@
 .footer-col-wrapper {
     font-size: 15px;
     color: $grey-color;
-    margin-left: -$spacing-unit / 2;
+    margin-left: calc(-1 * $spacing-unit / 2);
     @extend %clearfix;
 }
 
 .footer-col {
     float: left;
-    margin-bottom: $spacing-unit / 2;
-    padding-left: $spacing-unit / 2;
+    margin-bottom: calc($spacing-unit / 2);
+    padding-left: calc($spacing-unit / 2);
 }
 
 .footer-col-1 {
diff --git a/impressum.md b/impressum.md
index bd357e7..b8fb4ad 100644
--- a/impressum.md
+++ b/impressum.md
@@ -34,7 +34,7 @@ zusammen mit unserem [Freistellungsbescheid](foobar-ev_freistellungsbescheid.pdf
 ## Vertretungsberechtigte
 
 - Christian Roschow (Vorsitzender)
-- Sebastian Surminski (Stellvetretender Vorsitzender)
+- Tobias Cloosters (Stellvetretender Vorsitzender)
 - Jürgen Stuber (Schatzmeister)
 
 Der Vorstand ist unter der Anschrift des Herausgebers oder via E-Mail an <vorstand@die-foobar.de> erreichbar.
diff --git a/index.html b/index.html
old mode 100755
new mode 100644