html,body{margin: 0;padding: 0;} .pagebox{ position:relative; } @-webkit-keyframes scaleBan{ 0%{ transform: translate(-50%,-50%) scale(1); -ms-transform: translate(-50%,-50%) scale(1); -webkit-transform: translate(-50%,-50%) scale(1); } 50%{ transform:translate(-50%,-50%) scale(1.4); -ms-transform:translate(-50%,-50%) scale(1.4); -webkit-transform:translate(-50%,-50%) scale(1.4); } 100%{ transform: translate(-50%,-50%) scale(1); -ms-transform: translate(-50%,-50%) scale(1); -webkit-transform: translate(-50%,-50%) scale(1); } }