color code of title attribute background in html code example

Example 1: how to color in html

<h1 style="color: red;">Hello</h1>

Example 2: decroation of title using css

:root:lang(ja), [lang|=ja], :root:lang(ko), [lang|=ko] { text-underline-position: under right; }
:root:lang(zh), [lang|=zh] { text-underline-position: under left; }