By default, the platform does not have this option. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
div#terms-modal {
background-color: #000000;
}
div#privacy-modal {
background-color: #000000;
}
4. Save changes
Screenshots
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With code