Watermark Padding
mark-pad
Sets the padding between the watermark and the edge of the image. If no value is provided it will default to 5px. If mark-tile is specified, the value will also represent the padding between tiled watermark images, and must be 0 or greater. Use mark-pad[N] to style a specific additional watermark layer — styles do not inherit across watermark layers.
The edges where the padding is applied are determined by the alignment of the watermark, which can be changed using the mark-align parameter. If the mark-align parameter is unset, the padding will be applied on the bottom right of the watermark.
The following example has the parameter mark-align=top,right set:
This parameter accepts a relative length: a whole number is pixels, and a decimal between 0 and 1 is a fraction of the base image, taken per axis.