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The <h1> has a font-size: calc(32px + ((24 * (100vw — 800px))/799));. The typography on the page is meticulously calculated to work at every screen size.
<h1>
font-size: calc(32px + ((24 * (100vw — 800px))/799));
Check out Modularscale an online calculator you can use to create better font hierarchy.
“Never go to sleep without a request to your subconscious.” — Thomas Edison