如何在表单中定位div类？

Question

我有这个HTML，我想使用CSS作为目标。问题是我找不到正确的CSS选择器。

问题是. entry-content不起作用。两者都没有。event-manager-form。表单本身是Wordpress事件管理器表单，并且希望使用border-radius

进行样式设置

<div class="entry-content">
  <form action="/post-an-event/" method="post" id="submit-event-form" class="event-manager-form" enctype="multipart/form-data">
    <fieldset>

      <label>Your account</label>
      <div class="field 
    account-sign-in">
        You are currently signed in as <strong>Bla bla</strong>. <a c class="button" href="...">Sign out</a>.
      </div>
    </fieldset>

    <!-- Event 
    Information Fields -->
    <h2 class="section-title">Event Details</h2>

    <fieldset class="fieldset-event_title">
      <label for="event_title">Event Title<span class="require-field">*. 
    </span></label>
      <div class="field required-field">
        <input type="text" class="input-text event_title" name="event_title" id="event_title" placeholder="Event title" attribute="" value="" maxlength="" required />
      </div>

    </fieldset>
    <fieldset class="fieldset-         event_online">
      <label for="event_online">Online Event<span class="require- 
    field">*</span></label>
      <div class="field 
    required-field">
        <label><input 
    type="radio" name="event_online" id="event_online" 
    attribute="" value="yes"  /> Yes</label>
        <label><input 
    type="radio" name="event_online" id="event_online" 
    attribute="" value="no" /> No</label>