title: Bootstrap Thumbnails Leave gaps in between
body: <p>I'm trying to make a grid of Boostrap unevenly sized thumbnails. But some thumbnails are uneven, resulting in huge gaps between some rows. 
  <a href="https://i.stack.imgur.com/zozSZ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zozSZ.jpg" alt="picture of thumbnails gaps"></a></p>
  
  <p>I don't have any styling on the thumbnails.</p>
  
  <p>Is there a way to fix it without adding something like Masonry/Isotope/Salvattore? </p>