body{
	color:#fff;
	background-color:#000;
}
h1 {
    text-align: center;
    font-size: 4rem;
}

#tiles {
    width: 400px;
    margin: 0 auto;
    position: relative;
    background-color: white;
    padding: 8px;
    border-radius: 0.5rem;
}

.selected {
    background-color: #FFF;
    border: none;
    color: white;
}

.btn {
    font-size: 24px;
    height: 80px;
    width: 25%;
    cursor: pointer;
}