Sarcastic White is a theme for Codepen Embeds that changes the original appearance to a dark blue-ish look and feel. We've created the theme with a clean and uncluttered design pattern in mind, to achieve optimal focus and readability for code, syntax highlighting and UI components.
Highlight the entire url, and copy it to your clipboard.
Head over to your Embed Theme Builder. Whether you're editing an existing theme, or creating a new one, in the bottom left hand corner, you'll find a field labeled "Custom CSS". Paste that copied URL into the field and save the theme.