body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #1a1a1a;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

#openseadragon-viewer {
    width: 100%;
    height: 100%;
    background-color: #000;
}