.container { width:900px; margin:50px auto; text-align:center; } #myModel { position:absolute; top:0; left:0; background-color:rgba(9,9,9,0.63); width:100%; height:100%; z-index:1000; } .model-content { width:50%; text-align:center; background:#ffffff; border-radius:6px; margin:100px auto; line-height:30px; z-index:10001; }