小编use*_*966的帖子

我正在尝试展开提交按钮，使其与密码字段的大小相同。我正在使用代码 btn-block 但它不起作用。

<div class="container">
  <div class="row" style="margin-top:60px;">
    <div class="col-md-4 col-md-offset-4">


      <div class="span12" style="text-align:center; margin: 0 auto;">
        <form class="form-horizontal" style="width: 400px; margin: 0 auto;" method="post">
          <fieldset>
            <h3 style="color:dimgray;" class="sign-up-title">
              Bem-vindo de volta! Efetue seu login
            </h3>
            <hr class="colorgraph">
            <legend>
              Efetue seu login
            </legend>
            <div style='display:none'>
              <input type='hidden' name='csrfmiddlewaretoken' value='ImQqDNXbmiVQKGo3OsZlrepAzwfAu70B' />
            </div>
            <tr>
              <th>
                <label for="id_username">
                  Usuário:
                </label>
              </th>
              <td>
                <input id="id_username" type="text" name="username" maxlength="30" />
              </td>
            </tr>
            <tr>
              <th>
                <label for="id_password">
                  Senha:
                </label>
              </th>
              <td>
                <input type="password" name="password" id="id_password" /> …