alignment = position; 

Specifies the horizontal or vertical positioning (justification) of a tile within its cluster.

For a tile that is a child of a column, the possible values are left, right, or centered (default is left).

For a tile that is a child of a row, the possible values are top, bottom, or centered (default is centered).

You cannot specify the alignment along the long axis of a cluster. The first and last tiles in the cluster always align themselves with the ends of the column or row. Other tiles in the cluster are distributed evenly unless you adjust the distribution by using padding insertion points (see spacer_0).