Select all the layers

layers.css

div[class*="layer-"] {
position: absolute;
top: -10px; left: -10px;
right: -10px; bottom: -10px;
background-size: 100% auto;
background-repeat: no-repeat;
background-position: 0 0;
transition:0.1s;
}

layers.html

<div class="poster">
  <div class="shine"></div>
  <div class="layer-1"></div>
  <div class="layer-2"></div>
  <div class="layer-3"></div>
  <div class="layer-4"></div>
  <div class="layer-5"></div>
</div>