JSFiddle - React, Tailwind, and code Playground

HTML

<select>
  <option>1</option>
  <option selected>2</option>
  <option>3</option>
</select>

<select class="multiple" multiple>
  <option>1</option>
  <option selected>2</option>
  <option>3</option>
   <option selected>4</option>
    <option>5</option>
     <option selected>6</option>
</select>

CSS

.multiple {
  height: 150px;
}