H1 in SEO

I'm planning to apply H1 on our website for very pages but It's not possible because it will change the design as we all know H1 make the text big. So, I'm thinking to put h1 on the content but the text should not be change, it will look same font in the users eyes but it's h1 in Google. Is that possible? Is that legal or it's something sounds as black hat?

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