Preloader JS

$(window).load(function() {

    $(".loader_inner").delay(600).fadeOut();
    $(".loader").delay(600).fadeOut("slow");

});

Preloader sass

.loader
  background: none repeat scroll 0 0 #161616
  bottom: 0
  height: 100%
  left: 0
  position: fixed
  right: 0
  top: 0
  width: 100%
  z-index: 9999
  .loader_inner
    background-image: url("../img/preloader2.gif")
    background-repeat: no-repeat
    background-position: center center
    background-color: #161616
    height: 600px
    display: flex
    justify-content: center
    align-items: center