JSFiddle - React, Tailwind, and code Playground

HTML

Without border:<br>
<input type="number" value="21" max="99" min="18"> -
<select>
    <option>Option 1</option>
    <option>Option 2</option>
    <option>Option 3</option>
</select>
<hr>
    With Border:<br>
<input type="number" value="21" max="99" min="18" style='border: 1px solid black;'> -
<select style='border: 1px solid black;'>
    <option>Option 1</option>
    <option>Option 2</option>
    <option>Option 3</option>
</select>

CSS

input {
    padding:20px;
}
select {
    padding:20px;
}