<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="text_center">
<img src="https://www.planwallpaper.com/static/images/2ba7dbaa96e79e4c81dd7808706d2bb7_large.jpeg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/6-940622110b39cad584098e6749eac708.jpg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/2ba7dbaa96e79e4c81dd7808706d2bb7_large.jpeg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/6-940622110b39cad584098e6749eac708.jpg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/2ba7dbaa96e79e4c81dd7808706d2bb7_large.jpeg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/2ba7dbaa96e79e4c81dd7808706d2bb7_large.jpeg" width="280" height="280" class="img_polygon">
<img src="https://www.planwallpaper.com/static/images/2ba7dbaa96e79e4c81dd7808706d2bb7_large.jpeg" width="280" height="280" class="img_polygon">
</div>
</div>
.text_center {text-align: center;width: 100%;}
.img_polygon{position: relative;-webkit-transition: .6s all, .3s .3s -webkit-transform;transition: .6s all, .3s .3s transform;-webkit-clip-path: polygon(50% 0%, 50% 0%, 100% 50%, 50% 100%, 50% 100%, 0% 50%);clip-path: polygon(50% 0%, 50% 0%, 100% 50%, 50% 100%, 50% 100%, 0% 50%);opacity: .8; -webkit-filter: grayscale(100%); filter: grayscale(100%);}
img {border: 0px;border-style: solid; -webkit-transform-origin: left top; -ms-transform-origin: left top; -o-transform-origin: left top;transform-origin: left top;}
.img_polygon:hover { -webkit-clip-path: polygon(0% 0%, 100% 0%, 100% 50%, 100% 100%, 0% 100%, 0% 50%); clip-path: polygon(0% 0%, 100% 0%, 100% 50%, 100% 100%, 0% 100%, 0% 50%); -webkit-transform: scale(1.4); -ms-transform: scale(1.4);transform: scale(1.4);z-index: 10;box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);border-radius: 0px;opacity: 1;transform-origin: center center; -webkit-filter: grayscale(0%);filter: grayscale(0%);}
.img_polygon:nth-child(1n + 5) { -webkit-transform: translateY(-50%); -ms-transform: translateY(-50%); transform: translateY(-50%);}
.img_polygon:nth-child(1n + 5):hover {-webkit-transform: translateY(-50%) scale(1.4);-ms-transform: translateY(-50%) scale(1.4);transform: translateY(-50%) scale(1.4);}