Mobile Usability Issues - Google Search Console

Received the following error message from Google Search Console for the following page:

https://firewoodenergy.co.uk/

Search Console has identified that your site is affected by 3 Mobile Usability issue(s):

Top Issues

The following issues were found on your site:

Clickable elements too close together

Content wider than screen

Text too small to read

We recommend that you fix these issues when possible to enable the best experience and coverage in Google Search.

I can’t figure out how to resolve these issues.

Thanks in advance

What do we need to do to resolve these issues with Google?

Try to use a responsive design. This will automatically adjust the width of the content to fit the screen size.

I’ll have a look for another theme. Ideally, I’d like to keep the theme that I have. I had a quick look on Google and saw some code to edit but unfortunately that didn’t fix the issues on Google Search Console.