[Keithamus]

I agree, the site wasn't so clear.

My understanding is that it seems `align-items` is to do with the children of the element, while `align-content` is to do with the spacing with regards to the parent container. In some ways, `align-content` will always imply a certain "bunching" to the children (they are either stuck to the start, end, center or spaced evenly in some manner - but never changing order, wrap or size), whereas `align-items` changes how lone-items behave in the flow, be it start, end, center or some stretching).

These two URLs provide some decent visual demos & distinction:

https://css-tricks.com/almanac/properties/a/align-content/ https://css-tricks.com/almanac/properties/a/align-items/