.mw-stack { 	box-sizing: border-box; } .mw-stack > div { 	margin: 1px; 	overflow: hidden; } @media all and (min-width: 720px) { 	.stack-clear-left { 		float: left; 		clear: left; 	} 	.stack-clear-right { 		float: right; 		clear: right; 	} 	.stack-left { 		float: left; 	} 	.stack-right { 		float: right; 	} 	.stack-margin-clear-left { 		float: left; 		clear: left; 		margin-right: 1em; 	} 	.stack-margin-clear-right { 		float: right; 		clear: right; 		margin-left: 1em; 	} 	.stack-margin-left { 		float: left; 		margin-right: 1em; 	} 	.stack-margin-right { 		float: right; 		margin-left: 1em; 	} }