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:

<div class="card text-white bg-dark mb-3" style="max-width: 18rem;">
  <div class="card-header">Header</div>
  <div class="card-body">
    <h5 class="card-title">Dark card title</h5>
    <p class="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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