You need to master both Flexbox and CSS Grid in order to professionally build modern websites & web apps. If you haven't mastered both of them yet, I highly recommend going through my CSS Course.

With Flexbox in the default situation (after setting display: flex), you will get this layout if you have set a height on the flex-items:

However, if you don't set a height here, the default behavior in Flexbox is actually that the flex-items will stretch vertically:

When you use flex-direction: column, it switches. Now, the flex-items will stretch horizontally if you don't set a width:

By the way, I think CSS is the 'bottleneck' to most websites & web apps. I believe it's the highest-ROI skill you can master.

Before I mastered CSS, I lost a ton of time & energy fiddling around with CSS.

I was learning about advanced JavaScript topics when I couldn't even implement basic layouts in CSS...

So I created a CSS course to help you avoid the same mistake. Check it out here if you're interested.

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