minor css improvements

app/assets/stylesheets/gitlab_bootstrap/files.scss

@@ -3,7 +3,7 @@
  *
  */
 .file_holder {
-  border:1px solid #CCC;
+  border:1px solid #BBB;
   margin-bottom:1em;
   @include solid_shade;
 

app/assets/stylesheets/sections/header.scss

@@ -22,7 +22,7 @@ header {
    *
    */
   .app_logo {
-    width:230px;
+    width:200px;
     float:left;
     position:relative;
     top:-5px;
@@ -31,7 +31,7 @@ header {
 
       h1 {
         padding-top: 5px;
-        width:102px;
+        width:90px;
         background: url('logo_dark.png') no-repeat 0px -3px;
         float:left;
         margin-left:5px;

app/assets/stylesheets/sections/nav.scss

@@ -55,7 +55,7 @@ ul.main_menu {
 
     &.current {
       background-color:#D5D5D5;
-      border-bottom: 2px solid $style_color;
+      border-bottom: 1px solid #AAA;
       border-right: 1px solid #BBB;
       border-left: 1px solid #BBB;
       border-radius: 0 0 1px 1px;