.pause, .qr-code {
    margin: 0 auto;
    padding: 20px;
    display: contents;
}
.pause {
    color: yellow;
    border-radius: 20px;
    font-family: Helvetica;
    font-size: large;
    border: 5px solid yellow;
    text-align: center;
    display: none;
}
.qr-code {
    font-size: large;
    text-align: center;
}
.qr-code #qr-code {
    width: 100px;
}
.pause-button, .play-button {
    width: 4em; 
    top: 64px; 
    right: 32px;
}

.pause-button img, .play-button img {
    width: 64px;
    height: auto;
}
.play-button {
    display: none;
}