body{
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
	background: #ccc;
}

.button{
	position: relative;
	background: #efb77c;
	padding: 1em 2em;
	border: none;
	color: #fff;
	font-size: 1.2em;
	cursor: pointer;
	outline: none;
	overflow: hidden;
	border-radius: 100px;
}

.button span{
	position: relative;
	pointer-events: none;
}

button::before {
	content: "";
	--size: 0;
	position: absolute;
	left: var(--x);
	top: var(--y);
	width: var(--size);
	height: var(--size);
	background: radial-gradient(circle closest-side, #597673, transparent);
	transform: translate(-50%, -50%);
	transition: width 200ms ease, height 200ms ease;
}

button:hover::before{
	--size: 400px;
}