.overlay {
    overflow: hidden;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.3);
}

.overlay__content {
    top: 50%;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-height: 90%;
    max-width: 800px;
}

.overlay__close {
    position: absolute;
    right: 0;
    padding: 0.5rem;
    width: 2rem;
    height: 2rem;
    line-height: 2rem;
    text-align: center;
    background-color: white;
    cursor: pointer;
    border: 3px solid black;
    font-size: 1.5rem;
    margin: -1rem;
    border-radius: 2rem;
    z-index: 100;
    box-sizing: content-box;
}

.overlay__scan {
    position: absolute;
    top: 100%;
    padding: 0.5rem;
    width: 8rem;
    height: 2rem;
    line-height: 2rem;
    text-align: center;
    background-color: white;
    cursor: pointer;
    border: 3px solid black;
    font-size: 1.5rem;
    margin: -1rem;
    border-radius: 2rem;
    z-index: 100;
    box-sizing: content-box;
}

.overlay__select {
    position: absolute;
    left: 0;
    padding: 0.5rem;
    /*    width: 8rem;*/
    height: 2rem;
    line-height: 2rem;
    text-align: center;
    background-color: white;
    cursor: pointer;
    border: 3px solid black;
    font-size: 1.5rem;
    margin: -1rem;
    /*    border-radius: 2rem;*/
    z-index: 100;
    box-sizing: content-box;
}

.overlay__content video {
    width: 100%;
    height: 100%;
}

.overlay__content canvas {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

.overlay__scan_area {
    background-color: rgba(255, 255, 255, 0.25);
    border: 1px solid red;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}