Bug: Cart Export Not Scrollable

[danglorioso]

Describe the bug

When you add enough graphs to your cart, you cannot scroll down and hit the "Export" or "Clear All" buttons. Make this popup list scrollable.

Where Is Bug/How to Recreate

Steps to reproduce the behavior:

1. Go to charts or heatmap
2. Click "Add to" and add many figures to your cart.

Expected behavior

• Popup list should be scrollable