JSFiddle - React, Tailwind, and code Playground
HTML
<!DOCTYPE html>
<html>
<body>
<form>
<select required>
<option value="">--- bitte wählen ---</option>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
<input type="submit"/>
</form>
</body>
</html>