Strange line appearing under h2 within footer

I seem to have a strange line that appears under one of my headers, H2.

Code used was from mail chimp to input a subscribe form within the footer
and automate the subscribe process.

Here is the code:

  <div id="mc_embed_signup">
  <form action="*" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>

  <div id="mc_embed_signup_scroll">
  <h2>Want some inbox loving?</h2>
  <h3>Sign up for Cute Pink Boutique new brand clothing releases and 

  <div class="mc-field-group">
    <label for="mce-EMAIL">Email Address  <span class="asterisk"> </span>

  <input type="email" value="" name="EMAIL" class="required email" id="mce-EMAIL">


Also, to give you a better idea, here is a screenshot of the line under the header.

The platform is wordpress.

Screenshot of problem

Any help would be much appreciated.

Read more here: Strange line appearing under h2 within footer

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