Improve color contrast of text in code blocks

Author: tomasr8

static/sass/_base.scss

@@ -85,7 +85,7 @@ $darkerblue: #1e2933;
 $link-color: $blue;
 $link-hover: $darkerblue;
 
-$code-green: #11a611; 
+$code-green: #0c7d0c;
 $default-border-color: $grey-lighter; /* Set a generic border color here to keep them consistent */