Think of a better way to leaf through vertically-stacked items

[eeeeenchanted]

Commit or branch: master

Observed behavior

• When positioning the items to the bottom, we need to hover at the top to see each item

• When positioning the items to the top, they will occlude each other

Expected behavior

• The user would like to hover at the bottom to have the same effect as the first gif

Steps to reproduce

1. In the first case, I set pileItemOffset to [0, 5]
2. In the second case, I set pileItemOffset to [0, -5]