* { padding: 0; margin: 0; }
canvas { background: #eee; display: block; margin: 0 auto; }
button {
    background-color: grey;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    width: 200px;
}
#volumeDiv {
    width: 150px;
    height: 40px;
    margin: 0;
    transform-origin: 75px 75px;
    transform: rotate(-90deg);
}
label {
    font-family: sans-serif;
    font-size: 30px;
}
a:visited {
    color: blue;
}

.canvasBox {
    max-width: 90%;
}
@media (max-width: 450px) {
    #volumeDiv {
        width: 100px;
        height: 30px;
        transform-origin: 50px 50px;
        transform: rotate(0deg);
    }
}