The most confusing part of CSS styling is that font-size attribute i.e. how this will show in various resolutions.
em: This scalable unit is used in web document media due to scalability and their mobile-device-friendly environment. For instance one em is equal to current font-size i.e. if font-size of the document is 10pt then 1em is equal to 10pt and 2em is equal to 20pt etc.
px: This is fixed-size units i.e. one pixel is equal to one dot on the computer screen. So it does not scale upward for visually-impaired readers or downward to fit mobile devices.
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