JSFiddle - React, Tailwind, and code Playground

HTML

<select class="target">
  <option value="">--select--</option>
  <option value="1">option 1</option>
  <option value="2">option 2</option>
</select>

CSS

select {
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
  padding: 7px 15px;
  border: 1px solid #333;
  border-radius: 2px;
  font-size: 24px;
}
.target option:first-child {
  font-size: 12;
}