button.sound-toggle .icon-sound--off,
button.sound-toggle.sound-on .icon-sound--on {
    display: none;
}

button.sound-toggle.sound-on .icon-sound--off {
    display: block;
}

button.play-toggle {
    display: block;
    position: absolute;
    width: 100%;
    height: 50%;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
}