By default, the platform does not have this option. You can use the following function code.
Please follow the steps below:
1. Go to Appearance > Theme Editor.
2. Under Select theme to edit, choose (BuddyBoss Child/whatever theme is active), then click Select.
3. Below Theme Files, select Theme Functions (functions.php).
4. Append the code just before the closing PHP tag “?>”:
function bb_login_custom_css() { ?> <style> .login #login #login_error { background-color: #ddd; border-left-color: #ddd; color: #000; } </style> <?php } add_action( 'login_enqueue_scripts', 'bb_login_custom_css');
You may change the colors.
5. Click Update File to save the changes.
Screenshot