@media(max-width:640px){
  #grid{content-visibility:auto;contain-intrinsic-size:1200px}
  .card{contain:layout paint style}
  .card .pic{contain:paint}
  .mobileLoadMoreSentinel{
    grid-column:1/-1;
    text-align:center;
    font-size:11px;
    color:#777;
    padding:14px 0 18px;
  }
}