wp-calypso/client/my-sites/patterns/mixins.scss

@mixin patterns-page-width {
	max-width: 1440px;
	margin-left: auto;
	margin-right: auto;
	padding-left: 110px;
	padding-right: 110px;
	box-sizing: border-box;

	@media (max-width: $break-wide) {
		padding-left: 24px;
		padding-right: 24px;
	}
}