JSFiddle - React, Tailwind, and code Playground

HTML

<select id="evt_color"> 
<option value="#3366CC">Blue</option> 
<option value="#E070D6">Fuchsia</option> 
<option value="#808080">Gray</option> 
<option value="#4bb64f">Green</option> 
<option value="#ed9d2b">Orange</option> 
<option value="#FF9CB3">Pink</option> 
<option value="#EA4A4A">Red</option> 
</select>
<div id="someDiv">Colour sample</div>

JavaScript

$("#evt_color").change(function() {
    $("#someDiv").css("background-color", $(this).val());
}).change();