*{
 margin : 0;
 padding: 0;
 box-sizing: border-box;
}

html,
body {
	height: 100%;
	font-size: 5vw;
	font-style: bold; 
}

div {
	position: relative;
	height: calc(100% / 5);
}

div span {
	display: block;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);

}

button {
	padding: 20pt;
	cursor: pointer;
	border-radius: 20%;
}

button:hover {
	background-color: black;
	color: white;
}