In the new version 1.2.7 of Related Posts Thumbnails plugin there is an option to select output style. By default it will be same as in previous versions – based on blocks. You can now select the version, based on “List” and you can also turn off plugin CSS for this version completely. This is for more advanced users who wish to customize output as they desire.
Also List style produces clean output, without HTML errors, and this may be an alternative for users with complex theme design, who experienced overlapping effects with Blocks output.
In addition, the background color bug was fixed.