The CSS align-content property sets the distribution of space between and around content items along a flexbox's cross-axis or a grid's block axis.
This property has no effect on single line flex containers (i.e. ones with flex-wrap: nowrap). So the container must be set on wrap or wrap-reverse.
/* Basic positional alignment */
/* align-content does not take left and right values */
align-content: center; /* Pack items around the center */
align-content: start; /* Pack items from the start */
align-content: end; /* Pack items from the end */
align-content: flex-start; /* Pack flex items from the start */
align-content: flex-end; /* Pack flex items from the end */
/* Normal alignment */
align-content: normal;
/* Baseline alignment */
align-content: baseline;
align-content: first baseline;
align-content: last baseline;
/* Distributed alignment */
align-content: space-between; /* Distribute items evenly
The first item is flush with the start,
the last is flush with the end */
align-content: space-around; /* Distribute items evenly
Items have a half-size space
on either end */
align-content: space-evenly; /* Distribute items evenly
Items have equal space around them */
align-content: stretch; /* Distribute items evenly
Stretch 'auto'-sized items to fit
the container */
/* Overflow alignment */
align-content: safe center;
align-content: unsafe center;
/* Global values */
align-content: inherit;
align-content: initial;
align-content: unset;Source: https://developer.mozilla.org/en-US/docs/Web/CSS/align-content