Set $code-color and add padding to <pre>

src/colors.scss

@@ -12,3 +12,4 @@ $divider-color: #BDBDBD;
 //Set bootstrap colors
 $brand-primary: $primary-color;
 $body-color: $primary-text-color;
+$code-color: darken($accent-color, 10);

src/main.scss

@@ -32,6 +32,11 @@
 .content {
   margin: 64px auto;
 
+  pre {
+    padding: 16px;
+    background-color: $code-bg;
+  }
+
   blockquote{
     @extend .blockquote;
   }