There is a minor display issue in the StackExchange.com - reputation tab with the browsers.
In Google Chrome, there is a rectangle around the charts, but in Mozilla Firefox there is no rectangle displayed.
After inspect the element the following
<rect tag under the
<svg caused the issue:
<rect rx="5" ry="5" fill="#FDFDFD" x="0" y="0" width="963" height="400" stroke-width="0.000001" stroke="#4572A7"></rect>
The same kind of issue is already discussed in SO SVG rect not showing up in firefox but works on chrome
It seems the recent design change impacted the rectangle display.
Google Chrome Version 71.0.3578.98 (Official Build) (64-bit)
Mozilla Firefox 64.0 (64-bit)
UPDATE: The rectangle display issue is in the User's Activity tab -> reputation -> graph view also.