The necessary plugins for this demo are:
1. Elementor
2. DFD Extensions (it is included in the theme)
3. MC4WP: Mailchimp for WordPress
4. Contact Form 7

/*****************************/

The code for the Mailchimp form
MC4WP - Form - Add new form - paste into "Form code" - Save Changes

<div class="elementor-container">
  	<div class="elementor-column elementor-col-70">
  		<input type="email" name="EMAIL" placeholder="Type your email" required />
  	</div>
  	<div class="elementor-column elementor-col-30">
  		<input type="submit" value="SUBSCRIBE" />
  	</div>
</div>

Copy the shortcode (for example [mc4wp_form id=68]) and replace it in the demo.

/*****************************/

The code for the Contact form 7
Contact - Add New (or open the default one for editing) - paste into "Form" - Save

<div class="elementor-container dfd-custom-responsive" style="margin-bottom: 15px;">
    <div class="elementor-column elementor-col-50" style="padding-right: 10px;">
        <label>[text* Name placeholder "Name"]</label>
    </div>
    <div class="elementor-column elementor-col-50" style="padding-left: 10px;">
        <label>[email* Email placeholder "Email"]</label>
    </div>
</div>
<div class="elementor-container" style="margin-bottom: 15px;">
    <div class="elementor-column elementor-col-100" style="display: block;">
        <label>[email* Subject placeholder "Subject"]</label>
    </div>
</div>
<label>[textarea Message placeholder "Message"]</label>
<div style="text-align: center;">[submit "Send Message"]</div>
Copy the shortcode (for example [contact-form-7 id="8dd38d1" title="CF Underline"]) and replace it in the demo.