JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <fieldset>
        <div>
            <select>
                <option>Dummy Text</option>
            </select>
        </div>
        <div>
            <select disabled>
                <option>Dummy Text</option>
            </select>
        </div>
    </fieldset>
</form>
<p>&nbsp;</p>
<div class="box"></div>
<p>&nbsp;</p>
<div class="box"></div>

CSS

select[disabled]{
   border: 1px solid #ccc;
    background:  rgba(0,0,0,0.2 );
}
div.box{
    width:300px;
    height:50px;
    background: rgba(255,88,22,1);
}
div.box ~ .box{    
    background: rgba(255,88,22,0.5);
}