Add a background color to the Interstitial Post Grid containers (Rania)

By default, Rania’s Interstitial Post Grid features a light gray border around the post title, “read” more button, etc. Use the Code Hack below to add a background color to this container! Here’s an example of what it might look like:

You can use this Code Hack in conjunction with this one, to remove the gray borders altogether, if you wish! We use this exact customization on the <em>press blog—check it out here (scroll down to see).

Here is the code you need to implement a background color in the Interstitial Post Grid: