constrained image float issue wordpress full-site gutenberg

/*
* @link <https://wordpress.org/support/topic/left-and-right-image-alignment-issues-with-fse-themes/>
* @author https://wordpress.org/support/users/jharries/
* @todo widewidth... 
*/
@media only screen and (min-width : 768px) {
  .is-layout-constrained figure.wp-block-image.alignleft {
	  margin-left: calc( ( 100% - var(--wp--style--global--content-size)) / 2 );
 }

  .is-layout-constrained    figure.wp-block-image.alignright {
	margin-right: calc( ( 100% - var(--wp--style--global--content-size)) / 2 );
 }
}