You can use the built in grid function, put this into text editor with the url links to your images to create a 3 column grid:
<div class="grid-container">
<div class="grid-33 tablet-grid-33 mobile-grid-33">
..... insert image 1 here .....
</div>
<div class="grid-33 tablet-grid-33 mobile-grid-33">
..... insert image 2 here .....
</div>
<div class="grid-33 tablet-grid-33 mobile-grid-33">
..... insert image 3 here .....
</div>
</div>
Alternatively you can use Tom’s Lightweight Grid Columns