style.css

*{
    color: blanchedalmond;
    font-family: 'Times New Roman', Times, serif;
}
body{
    background: url('background.jpg') no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
    box-sizing: border-box;
}
.key{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 10vh;
    width: 10vh;
    border: 0.15rem solid white;
    position: relative;
    top: 40vh;
    box-sizing: border-box;
    margin: 0 3vw;
    padding: 1rem;
    transition: all 0.7s ease-in;
    box-shadow: 0 0 2px white;
    background: rgba(0, 0, 0, 0.4);
}
.key kbd{
    font-size: 2rem;
}
.playing{
    transform: scale(1.1);
    border-color: #fcff33;
    box-shadow: 0 0 5px white;
}
.sound{
    font-size: 0.8rem;
    color: #fcff33;
}