.bg 
{
  background-image: url("../images/contact4.jpg");
  /* height: 100%; */
  /* background-position: center; */
  background-repeat: no-repeat;
  background-size: cover; 
    background-attachment: fixed;
    background-position-x: center;
    /* width: 100%; */
    background-position-y: bottom;
  /* background-position: center; */
}