Need to center Mailchimp Embedded Form

Hi, Im struggling to centre the mailchimp embedded form and change the colour of the button to white.

<!-- Begin MailChimp Signup Form -->
<link href="//cdn-images.mailchimp.com/embedcode/slim-10_7.css" rel="stylesheet" type="text/css">
<style type="text/css">
	#mc_embed_signup_scroll{background:#716b79; clear:left; font-family: Brandon Grotesque; text-align: center; color: #ffffff}

#mc-embedded-subscribe{background:#fff; clear:left; font-family: Brandon Grotesque; position: center; }

	/* Add your own MailChimp form style overrides in your site stylesheet or in this style block.
	   We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. */
</style>
<div id="mc_embed_signup">
<form action="//willowbody.us12.list-manage.com/subscribe/post?u=1835588ed3a52367daf82dfe7&id=b2b6324204" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>
    <div id="mc_embed_signup_scroll">
	<label for="mce-EMAIL"> GET INSIGHTS INTO WELLNESS, NATURAL BEAUTY + HEALTHY EATS. #GLOWLIKEWILLOW</label>
	<input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required>
    <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
    <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_1835588ed3a52367daf82dfe7_b2b6324204" tabindex="-1" value=""></div>
    <div class="clear"><input type="submit" value="JOIN US" name="subscribe" id="mc-embedded-subscribe" class="button" ></div>
    </div>
</form>
</div>

<!--End mc_embed_signup-->

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