JSFiddle - React, Tailwind, and code Playground

HTML

prueba de outline
<br />
<select>
    <option value="test">test</option>
</select>

CSS

select{
    padding:10px;
    border-radius:20px;
    -webkit-border-radius: 20px;
    outline:none !important;
    border:2px #CCB19D solid !important;
}