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Ways to add CSS to class2 only if class1 exists?

I want to make class2 {display:none;} but only if class1 exists.

Basically I have an age-gate plugin which, when triggered/visible, is selectable via the "age-gate-form" class.

I want to have another class, "banner", be invisible when age gate is visible/triggered.

Is this doable without touching JS/jQuery? How is it doable?

I tried to check other answers and google a bit but I'm not sure i've found anything to do exactly what I need.

EDIT: 2 classes are

.age-gate-wrapper < If this exists Then

.pum-container {display:none !important;}


I tried to

.age-gate-wrapper.pum-container {display:none !important;}

on the page where both classes existed but it didnt work, pum-container is still visible

The two classes are in different elements (age-gate comes first)

Via Active questions tagged javascript - Stack Overflow https://ift.tt/F8M4XQ5

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