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The background for the focus of links is set by the plugin you are using. I would recommend you contact their support: https://projectdmc.org/support/plugin/twentig/
A quick solution could be:
body.has-background-white .site a:focus:not(.wp-block-button__link):not(.wp-block-file__button) {
background-color: transparent;
}You would have to insert this under Appearance > Customizer > Additional CSS.
