06f3cb2b78 added some styling to make the
embed previews prettier, and in particular added a bottom fading gradient to
make the embed description text fade out slowly, when it is out of bounds.
The fading used an ::after pseudo-element which had 100% height of the
`.data-container` which contained the title and the description of the
preview. This pseudo-element got overlaid on the title and made it
un-clickable.
This commit retains the visual appearance of the fade, while reducing the
height of the ::after pseudo element, so that it never gets overlaid on the
title, keeping it clickable always.
d92af69a03