Styling Contact Form 7 checkbox when checked

I want to change out the visual of the checked checkbox from blue background to match my theme. I cant seem to get it to show and have tried several options for the checked status. Any help for what selector to use on this would be very helpful.

Selectors that didn't work out.

.wpcf7-list-item > label:after > input[type=checkbox]:checked + span {}
.wpcf7-form .wpcf7-checkbox input[type=checkbox]:checked + span:after {}
span.wpcf7-list-item.first > input[type=checkbox]:checked {}
input[type="checkbox"]:checked {}