JSFiddle - React, Tailwind, and code Playground

HTML

<p class="foo" style="background-color: magenta">text</p>
<p class="foo" style="background-color: magenta">text</p>
<p class="foo" style="background-color: magenta">text</p>
<p class="foo" style="background-color: magenta">text</p>
<hr>
<button id="reset">reset</button>

CSS

.foo {
  color: cyan;
}

JavaScript

$(reset).click(() => {
	$('.foo')
  	.removeAttr('style')
    .removeAttr('class')
})