Shulker box's GUI elements are slightly offset in comparison to chest's

The GUI for the newly added shulker box has a few allignment differences in comparison to a chest, which shouldn't be the case as both have the same amount and arrangement of slots:

1) The top of the window is slightly lower.
2) The GUI title and the slots are slightly lower.
3) The "Inventory" text is slightly higher.

See both screenshots for comparison.