Полезняшка

[madhed]

.box {
	width: 440
	height: 440
	background: #222;
	margin: 0 auto;
	-webkit-transition: width 2s ease, height 2s ease;
	-moz-transition: width 2s ease, height 2s ease;
	-o-transition: width 2s ease, height 2s ease;
	-ms-transition: width 2s ease, height 2s ease;
	transition: width 2s ease, height 2s ease;
}

@media only screen and (max-width : 960px) {
	.box {
		width: 300
		height: 300
	}
}