Set the font, size, weight, line height and spacing, preview the sample text, and copy the typography CSS.
Font family, size, weight, line height, letter spacing and text alignment, all previewed on real sample text.
A line height around 1.4 to 1.6 for body text keeps lines comfortably readable; headings can be tighter.
List your preferred font first with generic fallbacks last, e.g. 'Inter', system-ui, sans-serif, so text always renders.