Match Background Size To Foreground Page. Do it manually or using scss rules. Matching Background and Foreground.
Click Design Backgrounds No Background. Scale the background image to be as large as possible so that the background area is completely covered by the background image. There are four different syntaxes you can use with this property.
Create a 2-D mask for initial foreground and background seed points.
Fseed V seedLevel 75. Display foreground and background seed points. Height and the multiple background syntax separated with comma. Some parts of the background image may not be in view within the background positioning area.