How can I position my div at the bottom of its container?

Answer 1

For those only have one child in the container, you can use the table-cell and vertical-align approach which worked reliably for positioning a single div at the bottom of its parent.

Note that using table-footer-group as other answers mentioned will break the height calculation of parent table.

#container {
    display: table;
    width: 100%;
    height: 200px;
}
#item {
    display: table-cell;
    vertical-align: bottom;
}

    
Single bottom item