.app{flex-direction:column;justify-content:center;align-items:center;display:flex}.window{border:15px solid #006565;width:80%;height:50%;margin:1em;transition:all 1s;position:absolute}.window-holder{width:100%;height:100%;position:relative}.computer{border:15px solid #000;width:1000px;height:500px;margin-top:1em}.computer-holder{background-color:#000;width:200px;height:100px}