Board Thread:Support Requests - Getting Technical/@comment-7117024-20170926013912

On two wikis I'm a staff member on, we've modified the infoboxes from the default. However, the font of the header (and image tabbers too it seems) is a serifed font instead of the more appearing regular font on the default infobox. Is there any way to fix this, like changing something in the coding? This is the coding for the wiki examples below, and this is the coding for another wiki with the same issue (infobox example).

Thank you! 