.img1{
height:300px;
}
#zhezhao{
z-index: 100;
background-color: rgb(0, 0, 0);
opacity: 0.5;
position: fixed;
width: 100%;
height: 100%;
}
#zhezhao2{
opacity: 1;
z-index: 989;
position: absolute;
background-color: white;
left: 35%;
top:22%;
}简单的不要不要的