Changing Background-color Of Bootstrap Accordion

I'm trying to change this white color. Code:

Solution 1:

.panel-body {background-color:black;}

if it doesn't work then:

.panel-body {background-color:black !important;}

Solution 2:

On bootstrap 4+ use bg-dark as collapse is indeed a card. Follow the card example:

<divclass="card text-white bg-dark mb-3"style="max-width: 18rem;"><divclass="card-header">Header</div><divclass="card-body"><h5class="card-title">Dark card title</h5><pclass="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p></div></div>

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