如何替换mailchimp CSS嵌入代码中的按钮样式？

如何解决如何替换mailchimp CSS嵌入代码中的按钮样式？

我不知道如何在下面的Mailchimp嵌入CSS中更改按钮样式或位置：

<!-- Begin Mailchimp Signup Form -->
<link href="//cdn-images.mailchimp.com/embedcode/classic-10_7.css" rel="stylesheet" 
type="text/css">
<style type="text/css">
#mc_embed_signup{background:#fff; clear:left; }
/* 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="https://7grainarmy.us2.list-manage.com/subscribe/post? 
u=e6f00f0dccb61295ecf1b51c4&amp;id=ebaa28ce5c" method="post" id="mc-embedded-subscribe-form" 
name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>
<div id="mc_embed_signup_scroll">
<div class="mc-field-group">
<label for="mce-EMAIL">email address <span class="asterisk">*</span>
</label>
<input type="email" value="" name="EMAIL" class="required email" id="mce-EMAIL">
</div>
<div id="mce-responses" class="clear">
    <div class="response" id="mce-error-response" style="display:none"></div>
    <div class="response" id="mce-success-response" style="display:none"></div>
</div>    <!-- 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_e6f00f0dccb61295ecf1b51c4_ebaa28ce5c" tabindex="-1" value=""></div>
<div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded- 
subscribe" class="button"></div>
</div>
</form>
</div>

- 首先，我想将按钮移到中间，并且我想用可点击的图像替换按钮，因为我有一个要使用的样式化按钮。我怎样才能做到这一点？我在wordpress上使用thee Slider Revolution插件，这是我正在使用的网站：http://laurenb9.sg-host.com/

谢谢！

解决方法

下面添加了自定义css以将按钮居中，并注释了将bg样式添加到何处：

      <header>
    <nav>
        <ul>
            <li>Example</li>
            <li>Example</li>
            <li>Example</li>
            <li>Example</li>
        </ul>
        <div class="absolute-div">

        </div>
    </nav>
</header>