* {margin: 0px; padding: 0px}

body {background-color: yellow;
	font-size: 2em;
	color: black;}

#cronometro {margin: 30px; 
	padding: 0px; 
	border: none;
	height: 500px;
	width: 500px;
	background: url(imagen.png) no-repeat;
	background-size: 100%;
	float: left;}

#tiempo {margin: 0px;
	padding: 3px;
	position: absolute;
	top: 350px;
	left:155px;
	font-size: 1.2em;}

#cambiar {margin: 0px;
	padding: 0px;
	position: absolute;
	top: 440px;
	left: 190px;}

#inicializar {margin: 0px;
	padding: 0px;
	position: absolute;
	top: 440px;
	left: 300px;}

.clear {clear: both;
	margin: 10px;}