align the flex items vertically.
align-items: stretch;
flex item 1
flex item 2
flex item 3
align the flex items vertically.
align-items: flex-start;
flex item 1
flex item 2
flex item 3
align the flex items vertically.
align-items: center;
align the flex items vertically.
align-items: baseline;
flex item 1
flex item 2
flex item 1