I threw it together to read a singular article. So, technically this is version 1.0 - should work fine for you unless tweaktown changes something. Enjoy!

The CSS is nothing fancy; Tested in Chrome. Tweaktown randomizes the IDs and Classes of the div elements that contain the content-blocking popup, so I made use of the nth-last-child(n) selector - since the popup is the last few div elements of the HTML body. The !important bits are there because it seems tweaktown is using JavaScript to inject the CSS into the element attribute itself, which need the !important bit added to override it.