fix incomplete shadow in input field

app/assets/stylesheets/framework/snippets.scss

@@ -57,20 +57,10 @@
   padding-right: 0;
   padding-top: $gl-padding;
 
-  a.btn {
-    width: 100%;
-  }
-
   .form-control {
     cursor: auto;
     width: 101%;
-    border-left: 0;
-    outline: none;
-    box-shadow: none;
-
-    &:active {
-      box-shadow: none;
-    }
+    margin-left: -1;
   }
 
   .embed-toggle {

app/views/shared/snippets/_header.html.haml

@@ -36,7 +36,7 @@
     .embed-snippet.pull-right.col-md-6
       .input-group
         .input-group-btn
-          %a.btn.btn-default.embed-toggle.dropdown-toggle{ 'data-toggle': 'dropdown' }
+          %a.btn.embed-toggle{ 'data-toggle': 'dropdown' }
             %span#embed-action Embed
             = sprite_icon('angle-down', size: 12)
           %ul.dropdown-menu.dropdown-menu-selectable.dropdown-menu-right