.blocka {
	background-color: white;
	top: 150px;
	left: 450px;
	height: 1400px;
	width: 1400px;
	border-radius: 25px;
	position: relative;
}

.blockb {
	background-color: black;
	top: 50px;
	width: 100%;
	height: 100px;
	position: absolute;
}

.blockc {
	background-color: black;
	bottom: 50px;
	width: 100%;
	height: 100px;
	position: absolute;
}

.blockb:hover {
	background-color: white;
}