> Just do a google search for flexible divs side by side. Start with two. Then switch to five. Tell me the solutions that work well.

I did like you asked. The first search result on google is a question on stack overflow. And the first comment provides an example that looks very much like flexible divs, side by side, between two and four based on the width of the container.

https://stackoverflow.com/questions/60615826/two-divs-side-b...

What didn't you like about the solution in that comment?