JSFiddle - React, Tailwind, and code Playground

HTML

<select class="my">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>

<select class="menor">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>

CSS

.maior{background:red; height:60px;}
select{width:60%;}

JavaScript

$(document).ready(function() {
		$(".my, .menor").prop('selectedIndex', -1);		
		$(".my").after("<div class='maior'></div>").prependTo(".maior");
});