The icon theme preview drop-down is out of alignment

Steps to reproduce

1. Start creating an AppWithinMinutes application
2. At "Step 3 - Locate your data", under 'Icon' section, click on the drop-down to display the icon options
3. Observe the icon theme preview drop-down placement (below "Preview with:")

Expected results

The icon theme preview drop-down is centered vertically on its background space (blue on Iceberg theme), or has some padding below it to fit into the main Icon drop-down box.

Actual results

The icon theme preview drop-down is not vertically aligned, the bottom of the drop-down hangs outside of the main Icon drop-down.

This also reproduces at "Step 4 - Customize your application home page " when creating an AWM and also on other places, like when creating a Template Provider from Wiki Administration.