'Can I refer to a DIV id or class in a PHP file from a HTML page?

I am trying to add my own custom contact form to a Blogger website project. I've got the contact form HTML code in the Blogger template and its own PHP file running on a server, which link I point to the form tag action. It sends email and both platforms seem to communicate well. Among many improvements I am currently making. My main concern is to learn how to send HTML formatted emails. Everytime a user submits a message, I would like to receive it in HTML format. The CSS below is meant to test this feature which later I will develop.

UPDATE:

    <?php
    ...
    $headers  = 'MIME-Version: 1.0' . "\r\n";
    $headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
    
    if ($_POST['Submit']) {
       if (empty($_POST['Phone'])) {
        $content = "<html>
              <head></head>
              <body>
                <div class='boldtext'>From:</div>
                $name
                <br/>
                <div class='boldtext'>E-mail:</div>
                $email
                <br/><br/>
                $message
               <style>
                 .boldtext {
                    font-weight: bold;
              }
              </style>
              </body>
              </html>";
if (mail ($to, $subject, $content, $from, $headers)) {
      echo '<div class="boldtext">Your message has been sent. Thank you!</div>';
   } else {
      echo '<div class="messageerror">An error has occurred. Try again later.</div>';
   }
}

The email client receives the email as plain text instead of HTML formatted though.

phphtmlcss


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