html {
font-size: 10px;
background:url(http://i.imgur.com/b9r5sEL.jpg) bottom center;
background-size: cover;
}
body,html {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.keys {
display:flex;
flex:1;
min-height:100vh;
align-items: center;
justify-content: center;
}
.key {
border:4px solid black;
border-radius:5px;
margin:1rem;
font-size: 1.5rem;
padding:1rem .5rem;
transition:all .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: 1.2rem;
text-transform: uppercase;
letter-spacing: 1px;
color:#ffc600;
}