<form method="POST">
    <select id="mode" name="mode">
        <option value="timer">Timer</option>
        <option value="clock">Clock</option>
        <option value="black">Black</option>
        <option value="test">Test</option>
      </select>
    <input type="text" name="timeLeft">
    <button type="submit">Submit</button>
</form>