Remove padding from pre code.

docs/assets/css/docs.css

@@ -690,6 +690,10 @@ code {
   border-bottom: 1px solid #ddd;
 }
 
+.highlight pre code {
+  padding: 0;
+}
+
 @media screen and (min-width: 768px) {
   .component,
   .component-example-fullbleed,

sass/docs.scss

@@ -709,6 +709,9 @@ code {
   white-space: pre;
   word-wrap: normal;
 }
+.highlight pre code {
+  padding: 0;
+}
 @media screen and (min-width: 768px) {
   .component,
   .component-example-fullbleed,