I’ve read the other 2 posts and have located the Collapse CSS file and edited it. Initally when the page loads, it shows the correct colors, but then it is overwritten by the following and reverts back to default colors:
<h4 data-collapse-id="choose_your_style" class="ppom-collapsed-title" style="color: rgb(255, 255, 255); background-color: rgb(240, 75, 75);">Choose Your Style<div class="arrowDown"></div><div class="collapseIcon">+</div></h4>
I’ve updated the original css file in plugins>ppom-addon-collapse>css>ppom-collapse-lib.css and I have even added the entire css into the WordPress Customizer with the same results.