Enumeration members
BottomCentre
BottomCentre: = "bottom-center"
BottomLeft
BottomLeft: = "bottom-left"
BottomRight
BottomRight: = "bottom-right"
CentreCentre
CentreCentre: = "center-center"
CentreLeft
CentreLeft: = "center-left"
CentreRight
CentreRight: = "center-right"
TopCentre
TopCentre: = "top-center"
TopLeft
TopLeft: = "top-left"
TopRight
TopRight: = "top-right"
the positioning of an overlay