JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
<head>
    <title>Adding * to requested fields</title>
</head>
<body>
  <form>
    <fieldset>
      <legend>Basic information:</legend>
      <input type="date" name="data" placeholder="es: Mr" required><label for="data">data:</label>
      <input type="text" name="nome" placeholder="es: Sandro" required><label for="nome">Name:</label>
      <input type="text" name="cognome" placeholder="es: Paganotti" required><label for="cognome">Surname:</label>
    </fieldset>
    <fieldset>
      <legend>Your thoughts:</legend>
      <textarea name="commento"></textarea>
    </fieldset>
    <small><span  class='red'>*</span> this a requested field</small><br/>
    <input type="submit" value="Send this form">
  </form>
</body>
</html>

CSS

fieldset{
    width: 300px;
    margin-bottom: 10px;
  }
  
  .red{
    color: black;
  }
  
  input, label{
    margin: 3px 0px;
  }
  
  textarea{
    width: 100%;
  }
  
  input[type="text"],input[type="email"]{
    float: right;
    clear: right;
  }
  
  label{
    float: left;
    clear: left;
  }
  
  input:required + label:after{
    content: ' *';
    color: black;
  }