No need for redirection, ContactForms will keep your users inside your site the whole time, easily integrating with your Webflow's form.
Try nowStyle them as you want in your Webflow or CMS of choice and let us do the dirty work.
<form class="form" method="get">
<input name="name" class="form-control my-4"
placeholder="Your name" required>
<input name="email" class="form-control my-4"
placeholder="An email to contact" required>
<textarea
name="message" class="form-control my-4"
placeholder="A simple message" required>
</textarea>
<button class="btn btn-primary my-4 submit-button">
Contact
</button>
</form>