Make codeblocks have a background

Author: chsasank

_static/css/pytorch_theme.css

@@ -116,3 +116,8 @@ footer p {
 nav .hidden-section {
     display: inherit;
 }
+
+/* Make code blocks have a background */
+.codeblock,pre.literal-block,.rst-content .literal-block,.rst-content pre.literal-block,div[class^='highlight'] {
+        background: rgba(0, 0, 0, 0.0470588);
+}