Closing animation isn't smooth

Problem/Motivation

When clicking on the X or next to the popup, the popup closes with a fadeOut-animation. The content of the popup also gets removed when closed, but this happens at the same time as the fadeOut, causing the animation to not be smooth.

Proposed resolution

Add a delay to remove the content of the popup. This needs to be done using a setTimeout-function, since the delay jQuery function doesn't seem to apply on .remove() or empty().