Reduce base vertical padding

app/assets/stylesheets/base/gl_variables.scss

@@ -99,7 +99,7 @@ $font-size-base:          $gl-font-size;
 //
 //## Define common padding and border radius sizes and more. Values based on 14px text and 1.428 line-height (~20px to start).
 
-$padding-base-vertical:     8px;
+$padding-base-vertical:     6px;
 $padding-base-horizontal:   14px;
 
 // $padding-large-vertical:    10px

app/assets/stylesheets/generic/selects.scss

@@ -4,10 +4,8 @@
     background: #FFF;
     border-color: #BBB;
     padding: 6px 14px;
-    font-size: 13px;
-    line-height: 18px;
+    line-height: 1.42857143;
     height: auto;
-    margin: 2px 0;
 
     .select2-arrow {
       background: #FFF;