JSFiddle - React, Tailwind, and code Playground

HTML

<select class='regularcolor'>
    <option>one</option>
    <option>two</option>
</select>
<select class='offcolor'>
    <option>one</option>
    <option>two</option>
</select>

CSS

select.regularcolor {
    border-color: rgb(169, 169, 169);
}

select.offcolor {
    border-color: rgb(170, 170, 170);
}