body {
        /* Add image */
        background-image: url("imgdffit.jpg");
  
        /* Make image center */
        background-position: center center;
  
        /* Make image fixed */
        background-attachment: fixed;
  
        /* Not repeat images */
        background-repeat: no-repeat;
  
        /* Set background size auto */
        background-size: auto;
      }
  
      /* Media query for mobile devices  */
      @media only screen and (max-width: 767px) {
        body {
          background-image: url("imgdffit.jpg");
        }
      }