I'm using the framework basscss that supports flexbox. Having some issues regarding equal/stretch heights.
<div class="flex mb2">
<div class="flex flex-wrap col col-4">
<div class="flex flex-wrap col-12">
<div class="self-start col-12 border">A1</div>
<div class="flex col-12 border py2">A2</div>
</div>
</div>
<div class="flex flex-wrap col col-4">
<div class="flex flex-wrap col-12">
<div class="self-start col-12 border">B1</div>
<div class="flex col-12 border py3">B2</div>
</div>
</div>
<div class="flex flex-wrap col col-4">
<div class="flex flex-wrap col-12">
<div class="self-start col-12 border">C1</div>
<div class="flex col-12 border py4">C2</div>
</div>
</div>
</div>
https://jsfiddle.net/dcy15y3r/
How can I make all A heights exactly the same, and the B heights to fill the remaining space?