html, body {
	height:100%;
 	margin: 0;
	padding: 0;
	min-width: 40rem;
	min-height: 40rem;
}

body {
        background:url(corrugation.png) repeat;
}

body,td,th {
	font-family: Helvetica, Arial, sans-serif;
	text-align: center;
	position: relative;
}

#a {
    position: absolute;
    top:50%;
    left:50%;
    transform: translate(-50%, -50%);
    box-shadow: 0px 1px 0px rgb(230, 170, 21);
}