The problem of maximum Radius of css3 Radial gradient

Radial gradient radial-gradient setting the gradient radius seems to be just these four values: closest-side,closest-corner,farthest-side,farthest-corner. Can you directly use px to set the radius distance?

Mar.28,2021

Circle with central 10px radius

background: radial-gradient(circle 10px at center, red, blue);
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