underline css style when hover code example

Example 1: css underline color

u
{
	text-decoration: underline;
  	text-decoration-color: red;
}
example of use: (in html)

<p>The word <u>CAT</u>, is underlined </p>

Example 2: Text that shows an underline on hover

&:hover {
      text-decoration: underline;
  }