JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <input id="input" name="" type="" style="width: 100px;">
    <br>
<select id="select" name="" style="width: 115px;">
    <option value="Value for Item 1" title="Title for Item 1">Item 1</option>
    <option value="Value for Item 2" title="Title for Item 2">Item 2</option>
    <option value="Value for Item 3" title="Title for Item 3">Item 3</option>
</select>
</div>

CSS

#container
{
        position: relative;
}

#input
{
    position: absolute;
    top: 0;
    left: 0;
    z-index: 999;
    padding: 0;
    margin: 0;
}

#select
{
    position: absolute;
    top: 0;
    left: 0;
    padding: 0;
    margin: 0;
}