JSFiddle - React, Tailwind, and code Playground

HTML

<select id="email" style="background-color: red">
    <option value="">Select Email Address</option>
    <option value="[email protected]">[email protected]</option>
    <option value="[email protected]">[email protected]</option>
</select>

JavaScript

$('#email').change(function () {
    if (this.value != '') {
        $(this).css({'background-color': 'white'});
    } else {
        $(this).css({'border': '5px' 'solid' 'green'});
    }
});