How To Add CSS? (External CSS, Internal CSS, Inline CSS).
External CSS
With an external style sheet, you can change the look of an entire website by changing just one file!
Internal CSS
An internal style sheet may be used if one single HTML page has a unique style.
Inline CSS
An inline style may be used to apply a unique style for a single element.
To use inline styles, add the style attribute to the relevant element. The style attribute can contain any CSS property.
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