JSFiddle - React, Tailwind, and code Playground

HTML

<select id="select-card" required>
      <option value=""></option>
      <option value="card">**** **** **** 1982</>
</select>
<p>Or enter a new one...</p>

CSS

#select-card:invalid + p { display: block; }
#select-card:valid + p { display: none; }