Fix code backgrounds

assets/sass/_base.sass

@@ -77,7 +77,7 @@ details[open] summary
     display: none
 
 pre
-    background-color: #eee
+    background-color: $code-background !important
 
 .img-responsive
     border-radius: 5px
@@ -143,6 +143,9 @@ pre
         vertical-align: baseline
         margin: 0 5px
 
+.navbar
+    background-color: $navbar-background-color
+
 .navbar-burger
     margin-right: auto
     color: $primary
@@ -269,6 +272,8 @@ pre
         border-left: .25rem solid #e5e5e5
         blockquote p:last-child
             margin-bottom: 0
+    code
+        background-color: $code-background
     table
         margin: 2em 0 2em 0
         width: 100%

assets/sass/_light-variables.sass

@@ -4,3 +4,4 @@ $primary: #00b8d4
 $secondary: #dbdbdb
 $h-color: #222222
 $link-hover: #000000
+$code-background: $secondary