.prune-captcha {
    margin: 16px 0;
}

.puzzle-container {
    position: relative;
}

.puzzle-background {
    width: 100%;
    height: 100%;
    position: absolute;
    background-repeat: no-repeat;
}

.puzzle-mask {
    background-color: whitesmoke;
    position: absolute;
    z-index: 1;
}

.puzzle-piece {
    border: 1px solid whitesmoke;
    position: absolute;
    background-repeat: no-repeat;
    z-index: 1;
}