Google webmaster just send me an email telling me there are problem on my site

The problems are the following

Text too small to read

Content larger than the screen

Click to expand...

I don't think I understand, how can the content be larger than the screen if the text is too small? I don't understand what google is telling me here?
By the way the font I'm using is roboto 26px how can this font be small?

Content larger than the screen means that you are not using adequate responsive patterns to reduce site according to a vertical screen, (lets say 320px wide), for example an image 400px wide that is not being rescaled

About the text, maybe its being rescaled to a smaller size on the mobile version. Maybe your desktop size is 26px but the mobile size is 12px. Check for it.

Exactly as mentioned above. You need to have proper code in place so that your elements don't overflow.

For text: I had same warning a couple months ago, went in CSS and made the text a little bit larger for mobile, then clicked verify and all good since.