JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div id="column1">One line</div>
    <div id="column2">Two lines<br /> Two lines</div>
    <div id="column3">Three lines<br /> Three lines<br />  Three lines</div>
</div>

CSS

#column1 {float: left; background: red} 
 #column2 {float: left; background: blue} 
#column3 {float: left; background: green}

JavaScript

var height = 0;
var thisheight = 0;
$("#container div").each(function() {
    thisheight =  $(this).css("height").replace("px", "") ;
    
 if ( thisheight > height) {
        height = thisheight;
    } 
});
$("#container div").css("height", height+"px");