five-for-the-future/themes/wporg-5ftf/css/utilities/_alignfull.scss

html {
	overflow-x: hidden;
}

.entry-header .alignfull {
	margin-left: calc(50% - 50vw);
	margin-right: calc(50% - 50vw);
	max-width: 100vw;
	width: 100vw;
}