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Trying to create CSS horizontal inline form with custom code - Can anyone help?

Hey everyone- I’m using an email provider which is kind of lowkey and not known called EmailOctopus and want to have an in-line horizontal sign up form with my newsletter. But to get it to look good i need to use custom css to change it-

The code that EmailOctopus give looks like this:

/*
<link rel="stylesheet"
      href="https://emailoctopus.com/bundles/emailoctopuslist/css/1.6/form.css"
>
<div class="emailoctopus-form-wrapper emailoctopus-form-unstyled null"
     style="font-family: Arial, &quot;Helvetica Neue&quot;, Helvetica, sans-serif; color: rgb(26, 26, 26);"
>
  <p class="emailoctopus-success-message">
  </p>
  <p class="emailoctopus-error-message">
  </p>
  <form action="https://emailoctopus.com/lists/b6cee513-a114-11ea-a3d0-06b4694bee2a/members/embedded/1.3s/add"
        method="post"
        data-message-success="Thanks for subscribing!"
        data-message-missing-email-address="Your email address is required."
        data-message-invalid-email-address="Your email address looks incorrect, please try again."
        data-message-bot-submission-error="This doesn't look like a human submission."
        data-message-consent-required="Please check the checkbox to indicate your consent."
        data-message-invalid-parameters-error="This form has missing or invalid fields."
        data-message-unknown-error="Sorry, an unknown error has occurred. Please try again later."
        class="emailoctopus-form"
        data-sitekey="6LdYsmsUAAAAAPXVTt-ovRsPIJ_IVhvYBBhGvRV6"
  >
    <div class="emailoctopus-form-row">
      <label for="field_0">
      </label>
      <input id="field_0"
             name="field_0"
             type="email"
             placeholder="Your Email"
             required="required"
      >
    </div>
    <div aria-hidden="true"
         class="emailoctopus-form-row-hp"
    >
      <input type="text"
             name="hpc4b27b6e-eb38-11e9-be00-06b4694bee2a"
             tabindex="-1"
             autocomplete="nope"
      >
    </div>
    <div class="emailoctopus-form-row-subscribe">
      <input type="hidden"
             name="successRedirectUrl"
      >
      <button type="submit"
              style="background-color: rgb(224, 224, 224); color: rgb(0, 0, 0); font-family: inherit;"
      >
        Send me courses
      </button>
    </div>
  </form>
</div>
<script src="https://emailoctopus.com/bundles/emailoctopuslist/js/1.6/form-recaptcha.js">
</script>
<script src="https://emailoctopus.com/bundles/emailoctopuslist/js/1.6/form-embed.js">
</script>
*/

And when that comes out It currently looks like this –

I am trying to get it to look exactly like this:

How do I make it look like the second image with CSS? And how do I make sure the Css connects to to embedded HTml in my webflow site?

Thanks!

Here is my site Read-Only: LINK
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