Pixels to offset from screen when calculating position of scroll.

Pixels to offset from screen when calculating position of scroll. If a single number is provided, the offset will be applied in both the top and bottom directions. To provide a unique, bottom and top offset just provide an object offset: { top: 10 } or offset: { top: 10, bottom: 5 }. Use a function when you need to dynamically calculate an offset.

• Pixels to offset from screen when calculating position of scroll.