.maincontent {
    position: relative;
    max-width: 100%;
background: linear-gradient(180deg,rgba(245,245,245,.4) 0%,rgba(245,245,245,.4) 100%),url(/imageserver/UserMedia/ruckroofing/homebg.jpg);
padding: 70px 250px;
background-position: center; 
  background-repeat: no-repeat; 
  background-size: cover; 
}