JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option>um</option>
    <option>dois</option>
</select>

<!-- no Mozilla, a seta do select aparece.. -->

CSS

select {
    -webkit-appearance:none;
    -moz-appearance:none;
    -o-appearance:none;
    appearance:none;
 	text-indent: 0.01px; 

	background: transparent;
	width:185px;
	height:22px;
	font-size:18px;
	border:0;
	color:#CC9;
	outline: none
}

option {
    font-size:13px;
	border:0;
	background-color:#1063A0;
	outline: none;
    width:100px; /* queria editar a largura do option tbm */
}