body {
    text-align: center;
    font-family: Arial, sans-serif;
}

.piano {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.key {
    border: 1px solid #000;
    height: 150px;
    width: 40px;
    background-color: white;
    box-shadow: 0 3px #666;
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    z-index: 1;
}

.key:active {
    box-shadow: 0 1px #666;
    transform: translateY(2px);
}

.key.black {
    background-color: black;
    width: 30px;
    height: 100px;
    position: absolute;
    margin-left: -15px;
    z-index: 2;
}

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