.retrodiv{position:relative;width:100%;height:618px}#ad-banner{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:9999;background:rgba(255,255,255,0);width:302px;height:252px;box-shadow:0 0 10px rgba(0,0,0,.5);display:flex;justify-content:center;align-items:center;opacity:1;transition:opacity 0.5s ease-out;pointer-events:auto;border-radius:8px}#close-ad{position:absolute;top:-21px;left:0;width:15px;height:15px;background:#ff5f5f;border:none;border-radius:5%;color:#fff;font-size:20px;font-weight:700;cursor:pointer;display:flex;justify-content:center;align-items:center;box-shadow:0 0 5px rgba(0,0,0,.3);transition:background 0.3s}#close-ad:hover{background:#ff3b3b}