The Graph extension doesn't provide a solution to fix overflow issue on mobile view, so if the image is extreme wide than viewport, the entire page would be scrollable in any direction on mobile phone, that is inconvenience for readers.
This problem is reproducable with https://en.m.wikipedia.org/wiki/Template:Graph:PageViews while you see this page on your mobile phone, and even before the image is loaded.
Mozilla/5.0 (Android 7.0; Mobile; rv:87.0) Gecko/87.0 Firefox/87.0
To fix that, you can integrate a @media rule from the following Wikipedia template:
https://en.wikipedia.org/wiki/Template:Graph:Chart/styles.css
