JSFiddle - React, Tailwind, and code Playground
HTML
<div id="red" class="rsNavItem rsThumb"></div>
<div id="blue" class="rsNavItem rsThumb"></div>
<div id="green" class="rsNavItem rsThumb"></div>
CSS
div {
display: inline-block;
width: 80px;
height: 80px;
margin-right: 5px;
border: thin solid grey;
}
JavaScript
$('.rsThumb').click(function(){
$('.rsThumb').css('background', 'none');
$(this).css('background', this.id);
});