Remove unused selectors.

apostrophe-2/css/blocks.css

@@ -332,11 +332,6 @@ body {
 	text-decoration: none;
 }
 
-.wp-block-button .wp-block-button__link:active,
-.wp-block-button .wp-block-button__link:hover,
-.wp-block-button .wp-block-button__link:focus {
-}
-
 .wp-block-button__link:not(.has-background) {
 	border: 2px solid #117bb8;
 	background: rgba(255, 255, 255, 0.25);