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.button {
	margin: 10px;
	padding: 20px;
	border: 2px solid #fff;
	text-align: center;
	text-transform: uppercase;
	-webkit-transition: .3s;
	transition: .3s;
	width: 200px;
	color: #fff;
}
.button:hover {
	cursor: pointer;
	border-radius: 30px;
}

<div class="button">Rounded Corners</div>