Shape.RelativeHorizontalPosition (Word)

Specifies to the relative horizontal position of a shape. Possible return values are wdRelativeHorizontalPositionCharacter - Relative to character, wdRelativeHorizontalPositionColumn - Relative to column, wdRelativeHorizontalPositionInnerMarginArea - Relative to inner margin area, wdRelativeHorizontalPositionLeftMarginArea - Relative to left margin, wdRelativeHorizontalPositionMargin - Relative to margin, wdRelativeHorizontalPositionOuterMarginArea - Relative to outer margin area, wdRelativeHorizontalPositionPage - Relative to page, wdRelativeHorizontalPositionRightMarginArea - Relative to right margin.

ActiveDocument.Background.RelativeHorizontalPosition = wdRelativeHorizontalPositionCharacter