Flexbox children not having same height - html

Question

I thought flexbox makes its children having same height, meaning all children will be as tall as the highest (tallest) child and parent makes this by having default value of align-stretch for cross axis (if it is flex-row). In my case it is not like so.
I have following pen:
Codepen link
<div class="flex w-full items-center flex-wrap">
<div class="flex flex-col md:w-1/2 items-center px-16 py-20 bg-red">
<h2 class="marjan-col">Smaller text</h2>
<p>This one has smaller text</p>
</div>
<div class="flex flex-col md:w-1/2 items-center px-16 py-20 bg-blue">
<h2 class="text-white">Bigger text that controls element height</h2>
<p class="text-white">
Blue element has more text thus making red element smaller and unable to fit entire height
</p>
</div>
</div>
Note that taller element (background red) is not having same height as the blue element.
I am using tailwind.css here, but I think code is self explanatory.

Answer 1

Remove items-center class from the wrapper class - this was adding align-items: center to your flexbox and overriding the default stretch behaviour - see demo below:
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tailwindcss/0.7.4/tailwind.min.css">
<div class="flex w-full flex-wrap">
<!-- CHANGED HERE -->
<div class="flex flex-col md:w-1/2 items-center px-16 py-20 bg-red">
<h2 class="marjan-col">Smaller text</h2>
<p>This one has smaller text</p>
</div>
<div class="flex flex-col md:w-1/2 items-center px-16 py-20 bg-blue">
<h2 class="text-white">Bigger text that controls element height</h2>
<p class="text-white">
Blue element has more text thus making red element smaller and unable to fit entire height
</p>
</div>
</div>