JSFiddle - React, Tailwind, and code Playground

HTML

<select multiple>
    <option class="myClass" selected>1111111</option>
    <option class="myClass">222222222</option>
    <option class="myClass">33333333</option>
    <option class="myClass">44444444</option>
</select>

CSS

select option:checked,
select option:hover {
    background-color: green;
}