@media only screen and (min-device-width : 320px) and (max-device-width : 1024px) {		
	h1{
		text-align:center;
	}
		#crono{
			width:100%;
			border:2px solid brown;
			padding:40px 0px;
			float:left;
			font-size:60px;
			text-align:center;
	}
	}