Kindle doesn't honor the property "display: flex", so you can't use it in a .KFX ebook. And this other property you are employing "grid-template-columns" is for "grid layouts"; you can't use it with "display: flex" but with "display: grid".
Regarding a solution for your issue (it seems that you are looking for something that also works on Kindle), can you post an image of the desired output? Post that and I will be able to help you more.
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