<div class="container">
  <a href="#"><img src="https://source.unsplash.com/200x200/?space" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?frog" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?mountain" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?lion" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?umbrella" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?paint" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?monster" alt=""></a>
  <a href="#"><img src="https://source.unsplash.com/200x200/?wooly" alt=""></a>
</div>
body {
  background: url("http://s15.postimage.org/veanrmv0r/purty_wood_3.png");
  padding: 20px;
}

.container {
  width: 90%;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: 0 2px 15px black;
  border-radius: 3px;
  background: #222;
  display: flex;
  flex-wrap: wrap;
}

li {
  flex: 1 0 1;
}

a,
img {
  display: block;
}
a {
  transition: all 0.3s;
   width: 25%;
}
img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.container:hover > a {
  filter: grayscale(1) blur(1px);
  opacity: 0.4;
}
.container:hover > a:hover {
  filter: none;
  opacity: 1;
  transform: scale(1.1);
  z-index: 20;
}
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External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js