JSFiddle - React, Tailwind, and code Playground

HTML

<select>
        <option val="">Select Option</option>
        <option val="1">Option 1</option>
        <option val="2">Option 2</option>
        <option val="3">Option 3</option>
        <option val="4">Option 4</option>
    </select>

CSS

select{
        margin:40px;
        background: yellow;
        color:#000;
        text-shadow:0 1px 0 rgba(0,0,0,0.4);
    }
    option:not(:checked) { 
        background-color: #FFF; 
    }