/* A soft blue-grey desk behind the app; paper and artwork keep their own colours. */
html:root,html.traditional-ui{background:#bccbd1!important}
html body,html.traditional-ui body,html body.book-interface{background:radial-gradient(ellipse at 50% 30%,#dde5e7 0%,#c9d6db 55%,#bccbd1 100%)!important;min-height:100dvh}