The align-content property changes the behavior of the flex-wrap property. It aligns flex lines. It is used to specify the alignment between the lines inside a flexible container. This property defines how each flex line is aligned within a flexbox and is only applicable if flex-wrap: wrap is applied i.e. if there are multiple lines of flexbox items present.
List of align-content property:
align-content: stretch|center|flex-start|flex-end|space-between|space-around|initial|inherit;