JSFiddle - React, Tailwind, and code Playground

HTML

<style>
.thumbnail {
  display: block;
  padding: 4px;
  line-height: 1;
  border: 1px solid #ddd;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;
  -webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075);
  -moz-box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075);
}
.thumbnail > img {
  display: block;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
}
.thumbnail .caption {
  padding: 9px;
}    
    
.span2 {
  width: 220px;
}
.thumbnail .caption {
  padding: 9px;
}
</style>
   
<div class="box_line" style="float: left; border: 1px solid red;">
    <div class="thumbnail span2" style="margin-bottom: 15px;">
       <img src="http://placehold.it/260x180" width="135" alt=""/>
       <div class="caption">
          <h4>Title 1</h4>
          <p>asgasg</p>
        </div>
    </div>
    
    <div class="thumbnail span2" style="margin-bottom: 15px;">
       <img src="http://placehold.it/260x180" width="135" alt=""/>
       <div class="caption">
          <h4>Title 1</h4>
          <p>asgasg asgasg asgasg asgasg asgasg asgasg asgasg asgasg asgasg asgasg asgasgasgasgasgasg asgasgasgasg asgasgasgasgasgasgasgasg asgasg</p>
        </div>
    </div>
    
    <div class="thumbnail span2" style="margin-bottom: 15px;">
       <img src="http://placehold.it/260x180" width="135" alt=""/>
       <div class="caption">
          <h4>Title 1</h4>
          <p>asgasg asgasg asgasg asgasg asgasg asgasg asgasg asgasg</p>
        </div>
    </div>    
</div>

JavaScript

function equalHeight(group) {    
    tallest = 0;    
    group.each(function() {       
        thisHeight = $(this).height();       
        if(thisHeight > tallest) {          
            tallest = thisHeight;       
        }    
    });    
    group.each(function() { $(this).height(tallest); });
} 

$(document).ready(function() {   
    equalHeight($(".thumbnail")); 
});