*, *::before, *::after{
    box-sizing: border-box;
}
body{
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.piano{
    background: #12CBC4;
	padding: 90px 40px 16px;
    display: flex;
	border-radius: 20px;
    box-shadow: 5px 8px 2px #999, 0 0 8px #000;
}

.key{
    width: var(--width);
    border-radius: 0 0 4px 4px;
    color: #555;
    text-align: center;
    font-family: 'Comfortaa', cursive;
}

.black{
    height: calc(var(--width) * 4);
    padding-top: calc(var(--width) * 3);
    --width: 35px;
    background-color: #000;
    margin-left: calc(var(--width) / -2);
    margin-right: calc(var(--width) / -2);
    z-index: 2;
	box-shadow: 2px 2px 0 #555;
}

.black.active{
    background-color: #333;
}

.white{
    height: calc(var(--width) * 3.5);
    padding-top: calc(var(--width) * 3);
    --width: 60px;
    background-color: #fff;
    border: 1px solid #000;
    border-top: 2px solid #000;
	box-shadow: 0px 2px 0 #555;
}
.white.active{
    background-color: #ccc;
	box-shadow: inset 3px 2px 3px #999, inset -3px 2px 3px #999;
}