a img {
  transition: opacity 400ms;
  opacity: 1; }
  a img:hover {
    opacity: .8; }

a img.hover_on:hover {
  opacity: 1; }

.jsTriggerScroll {
  opacity: 0;
  transition: opacity 800ms; }
  .jsTriggerScroll.jsShow {
    opacity: 1; }