Few grammatical errors

[kerreck]

In #align-items section, align-items: flex-end; property, redundant underscore:

By default, the cross axis is vertical. This means the flexbox items will be aligned vertically at the _bottom.

In #position section, all properties text description refer to yellow block, while block itself is reddish:

It also makes the element positioned: it will act as an anchor point for the absolutely positioned yellow block.

Overall, very useful project for CSS study, thank you.

[jgthms]

Thanks!