html,body{margin:0;padding:0;overscroll-behavior:none;animation:height 4s forwards}:root{--brightness: 100%}.header{width:100vw;background-color:#333;color:#fff;text-align:center;animation:lineheight 3s forwards}@keyframes height{0%{overflow:hidden;height:99.999dvh}95%{overflow:hidden;height:99.999dvh}to{overflow:visible}}