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<style> .area{ width: 100%; height:100vh; } .circles { position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; } .circles li { position: absolute; display: block; list-style: none; width: 20px; height: 20px; background: rgba(255, 255, 255, 0.7); animation: animate 25s linear infinite; bottom: -150px; } .circles li:nth-child(1){ left: 25%; width: 80px; height: 80px; animation-delay: 0s; } .circles li:nth-child(2){ left: 10%; width: 20px; height: 20px; animation-delay: 2s; animation-duration: 12s; } .circles li:nth-child(3){ left: 70%; width: 20px; height: 20px; animation-delay: 4s; } .circles li:nth-child(4){ left: 40%; width: 60px; height: 60px; animation-delay: 0s; animation-duration: 18s; } .circles li:nth-child(5){ left: 65%; width: 20px; height: 20px; animation-delay: 0s; } .circles li:nth-child(6){ left: 75%; width: 110px; height: 110px; animation-delay: 3s; } .circles li:nth-child(7){ left: 35%; width: 150px; height: 150px; animation-delay: 7s; } .circles li:nth-child(8){ left: 50%; width: 25px; height: 25px; animation-delay: 15s; animation-duration: 45s; } .circles li:nth-child(9){ left: 20%; width: 15px; height: 15px; animation-delay: 2s; animation-duration: 35s; } .circles li:nth-child(10){ left: 85%; width: 150px; height: 150px; animation-delay: 0s; animation-duration: 11s; } @keyframes animate { 0%{ transform: translateY(0) rotate(0deg); opacity: 1; border-radius: 0; } 100%{ transform: translateY(-1000px) rotate(720deg); opacity: 0; border-radius: 50%; } } </style> <body style="background-color: #fcfcfc; background-image: url('/common/images/theme/background/gray-19.jpg'); background-size: cover; overflow: hidden"> <div align="center" class="page-center" style="text-shadow: 1px 1px 1px white; font-family: Ubuntu, Arial, monospace; position: absolute; top: 40%; left: 50%; -ms-transform: translateX(-50%) translateY(-50%); -webkit-transform: translate(-50%,-50%); transform: translate(-50%,-50%);">  <h1> <span style="color: #aaa;">404</span> Not Found! </h1> <div align="left" style="margin-top: -20px;"> <a href="/" style=" color: #ccc; text-decoration: none;">iris.arsheet.ir</a> </div> </div> <div class="area" > <ul class="circles"> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> </div> </body>