Getting site to be "mobile compliant" for Google Search

So one of my sites shows a list of things, and I i've tried diffent tags for those such as <font size=4> or <h1> for those listings.

On mobile they show up real small, any idea of a tag to use that will come up large on both web browser and mobile without having to code a responsive rule in php?

Google Webmaster Tools is saying my site isn't 100% mobile compatible, and this is the only part that isn't readable so i'm guessing this section is the problem.

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