Steps to repro

1. Click on "say meow" here: https://jlt-cat-a-log.herokuapp.com/

Expected: You should see balloons appear and float their way up the screen, always unobstructed by other on-screen elements.
Actual: You see the balloons flowing up, but they sometimes appear behind certain UI elements, like Plotly charts.

Solution

We should bump Baloons' z-index to something ridiculous, like "one gazillion".