sd-webui-panorama-viewer/style.css

.panogalviewer-iframe body {
    overflow: hidden;
}

#panoviewer-iframe {
    width:100%;
    height:100vh;
    overflow: hidden;
}

.panogalviewer-iframe {
    z-index: inherit;
    flex: auto;
    width:100%;
    height:100%;
}