*{margin: 0; padding: 0} @keyframes autopopup { from {opacity: 0;margin-top:-200px;} to {opacity: 1;} } #close { background-color: rgba(64, 68, 65, 0.5); position: fixed; top:0; left:0; right:0; bottom:0; animation:autopopup 3.5s; } #close:target { -webkit-transition:all 1s; -moz-transition:all 1s; transition:all 1s; opacity: 0; visibility: hidden; } @media (min-width: 100%){ .container-popup { width:50%; } } @media (max-width: 100%){ .container-popup { width:50%; } } .container-popup { position: relative; margin: 5% auto; padding: 4px 3px; background-color: #e1fff5; color: #333; border-radius: 8px; } .container-popup img { width: 100% } .close { position: absolute; top:3px; right:3px; background-color: #33898B; padding:3px 5px; font-size: 15px; text-decoration: none; line-height: 1; color:#fff; }