https://www.google.com/webmasters/tools/mobile-friendly/
You can use this to test mobile friendliness.
Here are a few more websites to help:
https://validator.w3.org/mobile/
- https://validator.w3.org/mobile/
- http://mobiletest.me/ – This one lets you choose a device to emulate the browser
solved Check my site in different browser version for mobile friendliness