Changed header to stay at the top of the page.

app/assets/stylesheets/generic/common.scss

@@ -282,7 +282,7 @@ img.emoji {
 }
 
 .navless-container {
-  margin-top: 20px;
+  margin-top: 68px;
 }
 
 .description-block {

app/assets/stylesheets/sections/header.scss

@@ -7,6 +7,9 @@ header {
     margin-bottom: 0;
     min-height: 40px;
     border: none;
+    position: fixed;
+    top: 0;
+    width: 100%;
 
     .navbar-inner {
       filter: none;

app/assets/stylesheets/sections/sidebar.scss

@@ -11,6 +11,7 @@
   width: 100%;
   padding: 15px;
   background: #FFF;
+  margin-top: 48px;
 }
 
 .nav-sidebar {
@@ -131,9 +132,9 @@
   .sidebar-wrapper {
     width: 52px;
     position: fixed;
-    left: 50px;
+    top: 0;
+    left: 0;
     height: 100%;
-    margin-left: -50px;
     border-right: 1px solid #EAEAEA;
     overflow-x: hidden;