#nsmcarousel::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  top:0;
  background: rgba(0,0,0,.35);
  -webkit-box-shadow: inset 0px 0px 600px 87px rgba(0,0,0,1);
          box-shadow: inset 0px 0px 600px 87px rgba(0,0,0,1);
          z-index:2;
}
@media screen and (max-width: 500px) {
  #nsmcarousel::after {
    -webkit-box-shadow: inset 0px 0px 300px 20px rgba(0,0,0,1);
            box-shadow: inset 0px 0px 300px 20px rgba(0,0,0,1);
  }
}