.section {
    width: 100%;
  
}
.section-topimage
{
     position: relative;
     margin-top:88px;
    width: 100%;
    height: 0px;
    background: url("/images/topimg.png") 0 0 no-repeat;}
    
    @media screen and (max-width: 1185px) {
    .section-mac {
        background: url("/images/topimg.png") -220px 0 no-repeat;
    }
}