Minor CSS improvements

- larger collapse icons in editor
- smaller breadcrump height

public/css/module.less

@@ -385,7 +385,7 @@
   font-size: 1.2em;
   text-decoration: none;
   padding-left: 2em;
-  line-height: 2.5em;
+  line-height: 2em;
   background: @gray-light;
   position: relative;
   display: block;
@@ -462,6 +462,7 @@
   width: 100%;
   margin-bottom: 1em;
   border: 1px solid @gray-light;
+  font-family: inherit;
 
   pre {
     font-family: @font-family-fixed;