Please be advised that, as of now, BuddyBoss does not have an out-of-the-box option for this. Modifications are generally considered custom work; however, we are making an exception in this case. Kindly review our Support Policy here: https://www.buddyboss.com/support-policy/. Please try adding the following CSS code:

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

.mepr-form .submit .button-primary:hover {
background: #000 !important;
border-color: #000;
}

4. Save Changes