# CSS Flex Column Wrap: Example + Illustration

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](https://bytegrad.com/courses/professional-css?utm_source=blog-post&utm_medium=blog-post&utm_campaign=blog-post).

The illustration is pretty self-explanatory:

![CSS-Flexbox-Create-Multiple-Columns.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1636584648383/lBauRnCKf.png)

Note that you do need to set a fixed height on the parent element (e.g. `height: 1150px`). Otherwise the flex-items won't wrap -- they will just stretch out the flex-container more and more.

The example uses `align-content` instead of `align-items` because we have multiple columns after wrapping the flex-items. Use `align-items` when you have just 1 column (no wrapping).

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](https://bytegrad.com/courses/professional-css?utm_source=blog-post-2&utm_medium=blog-post-2&utm_campaign=blog-post-2) if you're interested.

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