Hi wmajor
You can try this tweak:
1 - Define new style option via the file: /templates/ja_mixstore/acm/features-intro/tmpl/style-1.xml
<field name="bg-color" type="list" default="bg-primary" label="FEATURES_BGCOLOR_LABEL" description="FEATURES_BGCOLOR_DESC">
<option value="bg-primary">BG Primary</option>
<option value="bg-white">BG Light</option>
<option value="bg-dark">BG Dark</option>
<option value="bg-blue">BG Blue</option>
</field>
https://prnt.sc/tinrdx
As you can see that I added a new option 'BG Blue', the value will be class .bg-blue that you need to style for it in next step.
2 - Declare the color for new class added above in the file: /templates/ja_mixstore/css/custom.css (Create this file if it doesn't exist)
.bg-blue {
background: #c5def9;
color: #344150;
}
Here is how it looks on frontend: https://prnt.sc/tinrlh
You can apply the same steps for other color as you wish.