app.css

body {
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
video {
    visibility: hidden;
    position: fixed;
    min-width: 100%;
    min-height: 100%;
}
#camera_button {
    position: absolute;
    border: 0;
    border-radius: 22px;
    width: 44px;
    height: 44px;
    bottom: 8px;
    right: 8px;
    opacity:0.4;
    background-color: black;
    -webkit-mask-image: url(camera.svg);
    mask-image: url(camera.svg);
    mask-size: 30px;
    mask-position: center;
    mask-repeat: no-repeat;
    -webkit-mask-size: 30px;
    -webkit-mask-position: center;
    -webkit-mask-repeat: no-repeat;
}


#compass {
    position: absolute;
    z-index: 99;
    top: 30px;
    opacity:0.4;
    right: 4px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: black;

    -webkit-mask-image: url(compass.svg);
    mask-image: url(compass.svg);
}
#compass_slice {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    position: absolute;
}

.canvas {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
}
#canvas4 {
    pointer-events: none;
}