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

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Slider Revolution for import - slider.zip

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

Contact form for home page
<div class="wpcf7-form dfd_contact_form preset1 hover_style_input_shadow_appear hover_style_input2_simple">
    <div class="container">
        <div class="">
            <div class="box">
                <p class="dfd-half-size padding-right"><label>Name[text* Text]</label>
                </p>
                <p class="dfd-half-size padding-left"><label>Phone[text* Phone]</label>
                </p>
                <div class="clear"></div>
                <p class="border-bottom"><label>Email[email* E-mail]</label>
                </p>
                <div class="clear"></div>
                <p class="border-bottom last"><label>Message[textarea* Textarea x6]</label>
                </p>    
                <div class="clear"></div>
            </div>
            <p class="dfd-full-size form_button" style="">
                [submit class:wpcf7-submit "Send Message"]
            </p>
            <div class="clear"></div>
        </div>
    </div>
</div>

Contact form for contact page
<div class="wpcf7-form dfd_contact_form preset1 hover_style_input_shadow_appear hover_style_input2_simple">
    <div class="container">
        <div class="">
            <div class="box">
                <p class="dfd-half-size padding-right"><label>Name*[text* Text]</label>
                </p>
                <p class="dfd-half-size padding-left"><label>Email*[email* E-mail]</label>
                </p>
                <div class="clear"></div>
                <p class="border-bottom last"><label>Message*[textarea* Textarea x7]</label>
                </p>    
                <div class="clear"></div>
            </div>
            <p class="dfd-full-size form_button" style="">
                [submit class:wpcf7-submit "Send Message"]
            </p>
            <div class="clear"></div>
        </div>
    </div>
</div>

Copy the shortcode (for example [contact-form-7 id="8dd38d1" title="CF Underline"]) and replace it in the demo.