Contribution Analytics graph overflows when panning

When viewing the charts in Contribution Analytics, the graph will "spill" out of its container when the user pans to view other data in the graph:

Screenshot, Chrome Version 79.0.3945.117 (Official Build) (64-bit) on macOS https://gitlab.com/groups/gitlab-org/-/analytics

Screenshot, Firefox 73.0b3 on macOS https://gitlab.com/groups/gitlab-org/-/analytics