A formula for responsive font-size
Briefly

With modern CSS, we can just write that function! It's calc(1.0625rem + 0.2604vw). I round this to 1rem + 0.25vw.
When specified in the font-size property of the root element, or in a document with no root element, 1rem is equal to the initial value of the font-size property.
Read at jameshfisher.com
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