UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36

Steps to reproduce the problem:
1. Go to https://developers.google.com/web/fundamentals/getting-started/push-notifications/step-07?hl=en#make-a-request-to-gcm
2. Scroll down to the "1. Make a request to GCM" section that has a long code block
3. Note that you can't grab the scrollbar thumb with the mouse, on Chrome for Linux.
3. 

What is the expected behavior?
Clicking on the scrollbar should let the user drag it

What went wrong?
Clicking on the scrollbar does nothing on Chrome on Windows and Linux. Since Mac OS doesn't have a scrollbar, the issue doesn't apply there.

Did this work before? Yes 

Chrome version: 49.0.2623.75  Channel: beta
OS Version: Goobuntu
Flash Version: Shockwave Flash 20.0 r0

Can reproduce on Chrome on Windows and Linux.

Also spotted at https://github.com/google/WebFundamentals/issues/2506