Sandi needs to format a Web site with 20 pages. She wants to use CSS to apply a style rule to the H3 selector on all pages in the site. What is the most efficient way for her to apply this formatting?

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Sandi needs to format a Web site with 20 pages. She wants to use CSS to apply a style rule to the H3 selector on all pages in the site. What is the most efficient way for her to apply this formatting?