.BackgroundViewer{background-position:50%;background-repeat:no-repeat;width:100%;height:100%}.BackgroundViewer-checkerboard{position:relative}.BackgroundViewer-checkerboard:before{content:"";z-index:-1;background-image:linear-gradient(45deg,var(--readonly_text-color)25%,transparent 0,transparent 75%,var(--readonly_text-color)0),linear-gradient(45deg,var(--readonly_text-color)25%,transparent 0,transparent 75%,var(--readonly_text-color)0);background-size:var(--offset_st)var(--offset_st);background-position:0 0,calc(var(--offset_l) - var(--border-thickness))calc(var(--offset_l) - var(--border-thickness));width:100%;height:100%;position:absolute}