Cant change button border on focus.

Hi there!

Thanks for your query.

Please use the following code in your custom CSS:

.sppb-btn.focus, .sppb-btn:focus {
    box-shadow: 0 0 0 3px rgb(0 255 99 / 25%);
}

I have used a shade of green with 25% opacity. You can use your desired color combination in the above code.

Note: Path towards custom CSS(Joomla 3): Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Hope this will serv your purpose!

Best Regards

Glad to know that:)

You may accept my answer in order to close the post.

Best Regards