_includes/newsletter.html
<div class="newsletter">
<form action="https://gsa.us9.list-manage.com/subscribe/post-json?u=6f1977de9eff4c384dc8d6527&id=cbc418738b&c=" method="get" id="contact-form" class="usa-flex-always usa-flex-end">
<div class="form-group">
<label id="newsletter" for="newsletter-email">Your email</label>
<input class="newsletter-flex-form" type="email" id="newsletter-email" required name="newsletter-email">
</div>
<div class="usa-sr-only">
<input type="hidden" name="b_6f1977de9eff4c384dc8d6527_cbc418738b" tabindex="-1" value="">
</div>
<input class="newsletter-flex-form button" type="submit" value="Sign up">
</form>
<div id="newsletter-success" style="display: none;">
<p class="newsletter-no-margin p-bold">You're subscribed</p>
<p class="newsletter-no-margin">You'll receive the newsletter at <span id="newsletter-response"></span> every week.</p>
<button class="usa-button usa-button-primary" id="button-reset">OK</button>
</div>
</div>