#hud-bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;background:#000}#hud-bg .slide{position:absolute;inset:-6%;background-size:cover;background-position:center;filter:blur(2px);transform:scale(1.06);opacity:0;transition:opacity 1200ms ease}#hud-bg .slide.on{opacity:1}