Styling the background of images in signatures


I recently installed a addon which deals with images but since then all transparent images and signature images show a white background. I managed to fix the image background for images in messages using:

.bbCodeImage {
background-color: #181818;

However, I don't really found out how to do the same for images used in signatures. So I am basically just looking for the css value of the signature bbcodeimage

Your help would be greatly appreciated.
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