#Mask { position: absolute; top: 0; left: 0; display: none; background-image: url(img/tweixinip.jpg); background-size: cover; width: 100%; height: 100%; z-index: 1000; } .model-content { width: 100%; height: 100%; text-align: center; background: #ffffff; border-radius: 6px; margin: 100px auto; line-height: 30px; z-index: 10001; }