The rem unit means "The root element's font size" (rem stands for "root em").
A pixel is a unit of measurement commonly used in graphic and web design. We can abbreviate
it using "px". You can convert mm to pixels – the length of a pixel is 0.26 mm or 0.0104
inches (provided that the resolution equals 96)
16 px
This calculator converts the CSS unit REM to the pixels. The conversion is based on the
default font size of 16 pixels, but it can be changed
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