Our current code is being used to display 4 images, but it lacks responsiveness compared to this link. Specifically, the middle 2 images in the second row are stacked vertically on smaller screens.
If you need the code snippet: Jsfiddle
We have a similar code implementation on this website which appears to be responsive.
.top-designs1 > h1, .mens-block > h1, .womens-collection > h1, .fan-book > h1 {color: #000;padding-top: 5px;text-align: center;}
.tow-grid1 .left {float: left;width: 50%;}
.tow-grid1 .right {float: right;width: 50%;}
.full-grid1 {margin-bottom: 10px;}
<div class="top-designs1">
<div class="tow-grid1">
<div class="full-grid1">
<img src="http://sbdev2.kidsdial.com:81/media/wysiwyg/a1.jpg" width="1000px" />
</div>
<div style="clear: both; margin-bottom: -10px;">
</div>
<div class="left">
<img src="http://sbdev2.kidsdial.com:81/media/wysiwyg/a2.jpg"}}" width="495px" />
</div>
<div class="right">
<img src="http://sbdev2.kidsdial.com:81/media/wysiwyg/a3.jpg"}}" width="495px" />
</div>
<div style="clear: both; margin-bottom: -10px;">
</div>
<div class="full-grid1">
<img src="http://sbdev2.kidsdial.com:81/media/wysiwyg/a4.jpg" width="1000px" />
</div>
</div>
</div>