Add navbar fixed classes

docs/_sass/global.sass

@@ -15,6 +15,7 @@ $carbon-space: 15px
 
 #carbon
   flex-grow: 1
+  min-height: 100px + ($carbon-space * 2)
   padding: 0
   position: relative
   &:hover
@@ -61,4 +62,4 @@ $carbon-space: 15px
     display: inline
     font-size: $size-small
     position: absolute
-    right: 10px
+    right: 10px

docs/_sass/specific.sass

@@ -53,6 +53,7 @@
   height: 240px
   margin-left: auto
   margin-right: auto
+  overflow: hidden
   position: relative
   text-align: center
   @each $name, $pair in $colors
@@ -160,4 +161,4 @@ $notification-padding: 1.25rem 2.5rem 1.25rem 1.5rem !default
   td
     vertical-align: middle
     img
-      vertical-align: middle
+      vertical-align: middle