The "Layer Material" and "Height" text within the "Superflat Customization" menu is positioned too close to the header separator

The Bug:

The "Layer Material" and "Height" text within the "Superflat Customization" menu is positioned too close to the header separator.

As a result, the shadow of the said text can have no padding between the header separator.

Steps to Reproduce:

1. Begin creating a new world.
2. Click on the "World" tab and select the "Superflat" world type.
3. Click on the "Customize" button and look at how close the "Layer Material" and "Height" text is to the header separator.

Observed Behavior:

The said text is positioned too close to the header separator, causing the shadow of the text to have no padding between the header separator.

Expected Behavior:

The said text would be positioned higher from the header separator. There should be at least one pixel of padding between the text and the header separator.