Is it possible to have the background color, that appears behind transparent images in a post, go to the edges of the browser? This happens when the image gallery setting is set to fullwidth, but then constrains the background color when it’s set to normal.
I isn’t possible to set for only behind transparent images, it is possible to set whole page area:
Please paste the custom css code to “Appearance > Customize : Additional CSS”
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WordPress Customization Service from 
