JSFiddle - React, Tailwind, and code Playground

HTML

<a class="hello" style="color: Red;">[Blank]</a>
<a class="hello" style="color: Green;">[Blank]</a>
<a class="hello" style="color: Blue;">[Blank]</a>

JavaScript

var elems = document.getElementsByClassName("hello");
for(var i = 0; i < elems.length; i++) {
    elems[i].innerHTML = "Hello world!";
}