style.css

body{
    margin: 0 auto;
    width: 1000px;
    background: #201035;
}
#keys{
    display: flex;
    flex-direction: row;
}
main{
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 20%;
}
#title > h1{
    color: #ffc600;
    text-align: center;
    font-family: sans-serif;
}
.key{
    
    background: #3d959e;
    border-radius: 5px;
    margin: 1rem;
    font-size: 1.5rem;
    padding: 1rem .5rem;
    transition: all 0.07s;
    width: 100px;
    text-align: center;
    color: white;
    text-shadow: 0 0 5px black;
    cursor: pointer;
    
}
kbd{
    display: block;
    font-size: 40px;
}
.sound{
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #ffc600;
}
.playing{
    transform: scale(2);
    border-color: #ffc600;
    box-shadow: 0 0 10px #ffc600;
    background: #e115ef;
   
}