Board Thread:Support Requests - Designing Your Wiki/@comment-44997142-20200714115108/@comment-26611127-20200715211928

You will have to turn off the "Europa Infobox Theme" feature located in your wiki's Special:WikiFeatures page.

This feature, when enabled, adds a custom theme to your portable infoboxes. This why they look different when compared to the ones on the official Big Brother Wiki.