*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.keys{
    background: url(https://nanaaaudi.files.wordpress.com/2017/09/image.jpeg?w=1200);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.key{
 border: 4px solid black;   
 border-radius: 5px;
 margin: 1rem;
 font-size: 1.5rem;
 padding: 1rem .1rem;
 transition: all 0.07s;
 width: 100px;
 text-align: center;
 color: white;
 background: rgba(0, 0, 0, 0.4);
 text-shadow: 0 0 5px black;

}
.playing{
    transform: scale(1.1);
    border-color: #ffc600;
    box-shadow: 0 0 10px #ffc600;
}
kbd{
    display: block;
    font-size: 40px;
}
.sound{
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #ffc600;
}