style.css

body {
  background: radial-gradient(#cee4c5 0%, #c4feab 100%);;
  font-family: sans-serif;
}
.wrapper {
  width: 400px;
  margin: 20px auto;
}
.title {
  font-size: 1.5rem;
  text-align: center;
}
ul#adventDoors {
	position: relative;
	list-style: none;
	padding: 0;
	margin: 0;
}
#adventDoors li {
	position: absolute;
}
#adventDoors li a {
	color: #fff;
	width: 100%;
	height: 100%;
	font-size: 24px;
	text-align: center;
	display: flex;
	flex-direction: column;
	justify-content: center;
	text-decoration: none;
	border: 1px #fff solid;
}
#adventDoors li a:not(.disabled):hover {
	color: #fff;
	background-color: transparent;
	background-color: rgba(255,255,255,0.15);
}
#adventDoors li a.disabled {
	border-color: #b6fe98;
	background-color: rgba(196,254,171,0.15);
	color: #b6fe98;
	cursor: default;
}