JSFiddle - React, Tailwind, and code Playground

HTML

<p id="p1">This paragragh doesn't use ::selection</p>
		
<p id="p2">This paragragh uses ::selection,highlight color is yellow.</p>
		
<p id="p3">This paragragh uses ::selection,highlight color is blue.</p>

CSS

#p2::selection {
			background: yellow;
		}
		#p3::selection {
			background: blue;
		}