hideBeforeJsLoads.css

/* If js doesnt load or just before it does: hide element for 2 seconds. */
.no-js .u-showIfNoJs {
  animation: showAfterLong 2000ms;
}

/* Hide when js loads and remove animation */
.js .u-showIfNoJs {
  animation: none;
  display: none;
}

/* You might want to change these properties to match your need */
@keyframes showAfterLong {
  0%,
  100%{
    visibility: hidden;
    overflow: hidden;
    height: 0;
    padding: 0;
  }
}