Boy, the markup for ACF Tabs are a doozy. The current implementation of tabs feels hacky, trendy, or both. I do a lot of frontend ACForms and there’s 0 wrappers around tab content. This makes any kind of custom styles or style tweaks pretty difficult.
Need a background color on different tab content? Can’t, it’s just field wrappers.
Need more space between the left tab sidebar and tab content? Can’t, it’s global field wrapper padding used as spacing. This means that you’ll need to add large left/right padding to all fields in that form.
Need more spacing between the top tabs and your tab content? Can’t there’s no wrapper for the tabbed fields to bounce off of.
Responsive? Hardly.
It would be nice to have a more traditional tab markup. Instead of absolutely positioning the left-sidebar of tabs and using a pseudo-element for background color, it could be a grid or flexbox. Grouping fields in tab wrappers as needed. This would end up giving developers an easier pathway to customizing and styling tabs as needed.
