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HTML 

              
                <section>
  <h1>Check Out These Bears</h1>
  
<ul class="photo-stack-grid">
  <li>
    <a href="#d">
      <figure class="photo-stack">
          
          
        <!-- 
            ***change aspect ratio of image - /200/400*** 
        -->
        <img src="http://placebear.com/200/200" alt="picture" />
          
          
      </figure>
      <span>Bears Over There</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/g/200/200" alt="picture" />
      </figure>
      <span>Some Bears Are Right There</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/400/400" alt="picture" />
      </figure>
      <span>That Bear Is Looking Right At You</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/611/611" alt="picture" />
      </figure>
      <span>What A Bear</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/309/309" alt="picture" />
      </figure>
      <span>Some Bears Are Right There</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/546/546" alt="picture" />
      </figure>
      <span>That Bear Is Looking Right At You</span>
    </a>
  </li>
  <li>
    <a href="#d">
      <figure class="photo-stack">
        <img src="http://placebear.com/g/400/400" alt="picture" />
      </figure>
      <span>What A Bear</span>
    </a>
  </li>
</ul>
</section>
!

CSS 

              
                *,
*:before,
*:after {
	box-sizing: border-box;
}
body {
  background: url(https://f.cl.ly/items/2u1z0Y0I1U061j410F08/debut_light.png);
}
section {
  max-width: 1000px;
  margin: 2.6em auto;
  padding: 0 4%;
}
h1 {
  font: normal 1.8em/1.3 Capita, Georgia, serif;
  margin: 0 0 1.2em;
  color: #8ab300;
}
.photo-stack-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
}
.photo-stack-grid:after {
  content: " ";
  display: table;
  clear: both;
}
.photo-stack-grid li {
  width: 46%;
  float: left;
  margin: 0 8% 2.8em 0;
}
.photo-stack-grid li:nth-child(2n) {
  margin-right: 0;
}

/* remember to clear first item in each row */
.photo-stack-grid li:nth-child(2n + 1) {
  clear: left;
}

.photo-stack-grid a {
  display: block;
  color: #333;
  text-decoration: none;
  font: 600 0.8em/1.3 "Open Sans", sans-serif;
  
}
span {
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  display: block;
}
.photo-stack {
	position: relative;
	margin: 0 4% 2em;
  display: block;
}
.photo-stack:before,
.photo-stack:after,
.photo-stack img {
	display: block;
	background: #ccc;
	border: 5px solid #fff;
  border-radius: 3px;
	padding: 1px;
	
}
.photo-stack:before,
.photo-stack:after {
  content: '';
	position: absolute;
	left: 0px;
	top: 0px;
	width: 100%;
	height: 100%;
	background: #969289;
  box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.3);
  transform: rotate(6deg);
}
.photo-stack:after {
	transform: rotate(10deg);
  z-index: -1;
}
.photo-stack img {
	transform: rotate(0deg);
	width: 100%;
  box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.2),
              0 14px 18px -12px rgba(0, 0, 0, 0.9);
}
.ie8 .photo-stack:before,
.ie8 .photo-stack:after {
	display: none;
}

@media (min-width: 620px) {
    body {
      font-size: 120%;
    }
    .photo-stack-grid li {
      width: 19%;
    }
    .photo-stack-grid li:nth-child(2n) {
      margin-right: 8%;
    }
    .photo-stack-grid li:nth-child(2n + 1) {
      clear: none;
    }
    .photo-stack-grid li:nth-child(4n) {
      margin-right: 0;
    }
    .photo-stack-grid li:nth-child(4n + 1) {
      clear: left;
    }
}
!

JS
!
999px

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