body{font:100.01% Verdana, Arial, Helvetica, sans-serif;background-color:blue;color: white;}
h1{margin:0;text-align:center;}
#container{position:absolute;overflow:hidden;text-align:center;width:400px;margin-left:-200px;left:50%;height:100px;margin-top:-50px;top:50%;color:blue;}
.button{width:400px;height:100px;background:yellow;font-size:200%;text-decoration:none;text-align:center;display:inline-block;overflow:visible;white-space:nowrap;cursor:pointer;border-radius: 12px;}
.button:link,.button:visited{font-weight:700;color:blue;line-height:100px;background-position:0 0;}
.button:active,.button:focus{outline:none;}
.button:hover{background:gold;}