fix 1px border on top of tab content

h/css/common.scss

@@ -535,7 +535,8 @@ blockquote {
   @include border-radius(1px);
   background: $white;
   border: solid 1px $grayLighter;
-  margin-top: -1px;
+  line-height: 1.4;
+  margin-top: -2px;
   padding: 16px;
   position: relative;
 

h/css/sidebar.scss

@@ -122,10 +122,6 @@ svg { -webkit-tap-highlight-color: rgba(255, 255, 255, 0); }
     top: 7px;
   }
 
-  .tab-content {
-    line-height: 1.4;
-  }
-
   &.collapsed {
     max-height: 0;
   }