font-size is best in em, 1em is a standard size for body text. Usually renderers assume 12pt = 1em exactly, so mostly pt also works. Never use pixels, rem, or physical size for font-size.
Note different font families can be larger or smaller than say Times Roman at the same size. Also different similar fonts (serif, sans, monospace, etc) can be a different size at same size setting.
There are loads of different monospace (AKA typewriter or console) fonts suitable for displaying/rendering code.
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