Update code block padding for tighter vertical spacing

Author: Ademfcan

src/docs/stylesheets/extra.css

@@ -181,7 +181,7 @@ body {
 
 .md-typeset .highlight pre {
   margin: 0;
-  padding: 1.25rem;
+  padding: 0.8rem 1.5rem;
   line-height: 1.6;
 }