Remove qualified element selectors in vertical-tabs by removing unneeded div, ul and li selectors in vertical-tabs css in seven and misc.
Remove from both(!) vertical-tabs.css in seven and misc, the ruleset to prevent input elements from overflowing their containers since this exists in system.base.css
This doesn't quite fit under existing meta cleanup css issues that so far list "module" css, because vertical tabs is not a module, it is under core/misc.
Vertical tabs can be tested editing a content type or configuring a block.