#myDiv{position:absolute;top:0;left:0;width:100%;height:100%;background-color:rgba(249,249,249,.8);border:1px solid #ccc;padding:10px;z-index:10;display:flex;justify-content:center;align-items:center;flex-direction:column}#myDiv iframe,#myDiv img,#myDiv video{width:100%;height:100%}#myButton,#newButton{position:absolute;bottom:20px;right:20px;width:200px;height:40px;background-color:red;color:#fff;border:none;cursor:pointer;z-index:99999}