Difference Between align-items and align-content in Flexbox
Both align-items and align-content are Flexbox properties used to align items along the cross axis, but they serve different purposes depending on the number of flex lines in the container.
align-itemsaligns individual items within a single flex line along the cross axis.align-contentaligns multiple lines of flex items (when wrapping occurs) within the flex container.align-itemsworks regardless of whether items wrap or not.align-contentonly applies when there is extra space in the cross axis and whenflex-wrapis enabled.align-itemscontrols how each item is aligned within its line, whilealign-contentcontrols how the lines themselves are spaced inside the container.
In this example, align-items: center vertically centers each item within its line, while align-content: space-between distributes the multiple lines evenly across the container height.
Use
align-itemsfor aligning items within a single row or column.Use
align-contentwhen dealing with multiple flex lines (usingflex-wrap).Combine both for fine-tuned control over layout alignment along the cross axis.
If your layout has only one line of items,
align-contenthas no visible effect.