How can I add a class name or assign an ID to a form element that I can use to reference to it on my css files.

Hey Bagzli,
It's a piece of cake to do.

Just have a look at the sample I made below.
Just adapt it to your own code and you're good to go!

function Form(){
  $actions = new FormAction('submit', 'Submit Form');

  $textfield = new TextField('Text');
  $textfield->setAttribute('class', 'your-class-name goes-here you-can-have-as-much-as-you-want');
 
  $emailfield = new EmailField('Email');
  $emailfield->setAttribute('id', 'enter-your-id-here');

  $fields = new FieldList(
      $textfield,
      $emailfield
  );

  $form = new Form($this, 'Form', $actions, $fields);
  new $form;
}

Just make sure you have the CSS linked up to the page with the respective form on it and you'll be sussed out in no time! :)

Let me know how you go,
Stephen

Thank you very much!

Thank you very much.

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