body{
color: #FFFFFF;
background: #000000;
width:100%;
height:100%;
background-size:contain; 
background-size:cover;
}
.b1{
	width: 200px;
	height: 80px;
	margin: 10px 10px;
	background: linear-gradient(to top left, #C0C000, #FFFF80);
}
.b1:hover{
	background: #FFFFC0;
}
h1{
font-size: 64px;
}
.rde,.rdd{
	width: 100px;
	height: 100px;
	margin: 10px 10px;
	font-size: 64px;
}
.rdd{
	color: #FFFFFF;
	background: linear-gradient(to top left, #000000, #400000);
}
.rde{
	background: linear-gradient(to top left, #0000FF, #FFFFFF);
}
.rde:hover{
	background: #FFFFFF;
}
.ct{
text-align:center;
}