style.css

@import url('https://fonts.googleapis.com/css2?family=Unna:wght@400;700&display=swap');
*{
    margin: 0;
    padding: 0;
    font-family: 'Unna', serif;
    box-sizing: border-box;
    
}
body{
    background-image: url(img/music-player-2951399.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    height: 100vh;
    background-position: center;
    color: white;
    font-size: 5vw;
}
.key1{
    height: 6vw;
    width: 6vw;
    background-color: #36454F;
    text-align: center;
    border-radius: 7px;
    line-height: 6vw;
    transition: width 1s ,height 1s, transform 1s ;
    
}
.key1:hover{
    height: 6vw;
    width: 6vw;
    transform:rotate(360deg);
    
}
.key{
    display:flex;
    justify-content: space-evenly;
    height: 70vh;
    align-items: end;
    
}
.key1 span{
    display: block;
    font-size: 2vw;

}
.position{
    position: absolute;
}