.banner{
width: 100%;
min-height: 300px;
min-width: 1090px;
overflow: hidden;
background-image: url('http://img.ishanshan.com/gimg/n/20191023/e010364b158f406ccfc4e92eea88399e');
background-position: center center;
background-repeat: no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
}