Base form HTML template

form.html

<form class="form">
  <input type="hidden" name="project_name" value="nameOfSite">
  <input type="hidden" name="admin_email" value="EmailForSending">
  <input type="hidden" name="form_subject" value="SubjectOfMail">
  <div class="input-form">
    <input type="text" name="name" placeholder="Name">
  </div>
  <div class="input-form">
    <input type="tel" name="phone" placeholder="Phone">
  </div>
  <div class="input-form">
    <input type="email" name="email" placeholder="E-mail">
  </div>
  <div class="button-form">
    <button type="submit">Send</button>
  </div>
</form>