.stellar-block {
  background-attachment: fixed;
  background-position: center 0%;
  position: relative;
  background-repeat: no-repeat;
  padding-bottom: 0px;
  padding-top:0px;
  z-index: 8;
   background-color:#1b1b1b; 

}

@media only screen and (max-width: 979px) {  
  .stellar-block  {
    background-attachment: scroll!important;
    background-position: 50% 50%!important;
    position: relative;
    background-repeat: no-repeat!important;
    z-index: 8
  }
}