I need something like min-h-4xl so when context of the div is empty it will still be same height as other divs with the text. So when there is no emoji (text) i need to keep same size.
https://fragmentio.com/english-english/in_the_long_run Here we use same size block to show phrases that are hard to pronounce in different languages and sometime there is missing translation or the emoji.
I don't want to hardcode min-h-size like this min-h-24, because later i can easily forget to change it, and change defaults for text sizes. And I don't want to show some hidden text in this block.

The immediate children of the flex layout are already equal height. Thus you should be able to take advantage of this and apply
height: 100%to the element that draws the border to have the elements be of visually the same height: