css - 选择元素的html表单全宽

Question

我正在尝试设置一个 (mailchimp) 电子邮件注册表单，并且所有表单元素都应具有完整的宽度。我需要在 html 代码中设置所有样式(不可能使用外部 css 文件)。我试图让所有元素都达到全宽，但出于任何原因，选择元素和我的按钮没有全宽(但“接近”全宽)。有人可以解释原因，甚至可以展示如何使这些元素与其他元素大小相同的解决方案吗？

谢谢!

(表格的某些部分是德语。)

<!-- Begin MailChimp Signup Form -->
<div id="mc_embed_signup"><form id="mc-embedded-subscribe-form" class="validate" action="" method="post" name="mc-embedded-subscribe-form" target="_blank">
<div id="mc_embed_signup_scroll">

<div class="mc-field-group"><label for="mce-EMAIL"><h1>Email</h1></label>
  <input id="mce-EMAIL" class="required email" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none; background: #ffffff;" type="email" name="EMAIL" value="" /></div>

<p><div class="mc-field-group"><label for="mce-SALUTATION"><h1>Anrede</h1></label>
  <select id="mce-SALUTATION" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none; background: #ffffff;" name="SALUTATION">
    <option value=""></option>
    <option value="Frau">Mrs.</option>
    <option value="Herr">Mr.</option>
    </select></div>

<p><div class="mc-field-group"><label for="mce-FNAME"><h1>Vorname</h1> </label>
  <input id="mce-FNAME" type="text" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none;" name="FNAME" value="" /></div>


<div id="mce-responses" class="clear">&nbsp;</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;"><input tabindex="-1" type="text" name="b_8f44437b2b26a07918f0d32dd_afef57f14e" value="" /></div>

<div><input id="mc-embedded-subscribe" class="button" style="width: 100%; padding: 0.5em 0.2em; margin-top: 1.05em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; shadow: none; background: #790000; color: #ffffff;" type="submit" name="subscribe" value="Jetzt Anmelden" /></div>
</div>
</form></div>
<!--End mc_embed_signup-->

Answer 1

<!-- Begin MailChimp Signup Form -->
<div id="mc_embed_signup"><form id="mc-embedded-subscribe-form" class="validate" action="" method="post" name="mc-embedded-subscribe-form" target="_blank">
<div id="mc_embed_signup_scroll">

<div class="mc-field-group"><label for="mce-EMAIL"><h1>Email</h1></label>
  <input id="mce-EMAIL" class="required email" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none; background: #ffffff;box-sizing:border-box" type="email" name="EMAIL" value="" /></div>

<p><div class="mc-field-group"><label for="mce-SALUTATION"><h1>Anrede</h1></label>
  <select id="mce-SALUTATION" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none; background: #ffffff;box-sizing:border-box" name="SALUTATION">
    <option value=""></option>
    <option value="Frau">Mrs.</option>
    <option value="Herr">Mr.</option>
    </select></div>

<p><div class="mc-field-group"><label for="mce-FNAME"><h1>Vorname</h1> </label>
  <input id="mce-FNAME" type="text" style="width: 100%; padding: 0.5em 0.2em; margin-top: 0.5em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; box-shadow: none;box-sizing:border-box" name="FNAME" value="" /></div>


<div id="mce-responses" class="clear">&nbsp;</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;"><input tabindex="-1" type="text" name="b_8f44437b2b26a07918f0d32dd_afef57f14e" value="" /></div>

<div><input id="mc-embedded-subscribe" class="button" style="width: 100%; padding: 0.5em 0.2em; margin-top: 1.05em; margin-bottom: 1.5em; line-height: 1.5em; border: 1px solid #606060; shadow: none; background: #790000; color: #ffffff;box-sizing:border-box" type="submit" name="subscribe" value="Jetzt Anmelden" /></div>
</div>
</form></div>
<!--End mc_embed_signup-->