Kanboard-Prod/assets/css/src/screenshot.css

#screenshot-zone {
    position: relative;
    border: 2px dashed #ccc;
    width: 90%;
    height: 250px;
    overflow: auto;
}

#screenshot-inner {
    position: absolute;
    left: 0;
    bottom: 48%;
    width: 100%;
    text-align: center;
}

#screenshot-zone.screenshot-pasted {
    border: 2px solid #333;
}