Align Items in CSS using Flexbox

div {
    display: -webkit-flex; /* Safari */
    -webkit-align-items: center; /* Safari 7.0+ */
    display: flex;
    align-items: center;
}

References
https://www.w3schools.com/cssref/css3_pr_align-items.asp
https://www.w3schools.com/css/css3_flexbox.asp