Fix navbar height

src/assets/styles/spec/components/topbar.scss

@@ -12,7 +12,6 @@
   background-color: $default-white;
   border-bottom: 1px solid $border-color;
   display: block;
-  height: $header-height;
   margin-bottom: 0;
   padding: 0;
   position: fixed;
@@ -31,6 +30,8 @@
   .header-container {
     @include clearfix;
 
+    height: $header-height;
+
     .nav-left,
     .nav-right {
       list-style: none;