导航栏中的下拉菜单被隐藏

Question

在现有的导航栏菜单中，我想在最后一个菜单项上添加和下拉菜单。但是，通过单击下拉菜单，菜单被隐藏了 html 正文，看起来像这样：

下拉菜单在Action menu上，点击时已经隐藏

这是我尝试做的事情：

html,
body {
  background: #f7f7f8
}

.text-white {
  color: #fff !important;
}

section.header {
  padding: 90px 0;
}

.logo {
  line-height: 60px;
  /*position: fixed;*/
  float: left;
  margin: 0 46px;
  color: #FFF;
  font-weight: bold;
  font-size: 20px;
  letter-spacing: 2px;
}

nav {
  /*display: flex;*/
  background: #099cec;
  height: 64px;
  color: #FFF;
  width: 100%;
  line-height: 60px;
}

nav ul {
  line-height: 60px;
  list-style: none;
  background: rgba(0, 0, 0, 0);
  overflow: hidden;
  color: #FFF;
  padding: 0;
  text-align: right;
  margin: 0;
  padding-right: 40px;
  transition: 1s;
}

nav.black ul {
  background: #000;
}

nav ul li {
  display: inline-block;
  padding: 0 40px;
  ;
}

nav ul li a,
nav ul li a:hover {
  text-decoration: none;
  color: #FFF;
  font-size: 16px;
}

.menu-icon {
  line-height: 60px;
  width: 100%;
  background: #000;
  text-align: right;
  box-sizing: border-box;
  padding: 15px 24px;
  cursor: pointer;
  color: #fff;
  display: none;
}

@media(max-width: 786px) {
  .logo {
    /*position: fixed;*/
    color: #FFF;
    top: 0;
    margin-top: 16px;
  }
  nav ul {
    max-height: 0px;
    background: #000;
  }
  nav.black ul {
    background: #000;
  }
  .showing {
    max-height: 34em;
  }
  nav ul li {
    box-sizing: border-box;
    width: 100%;
    padding: 24px;
    text-align: center;
  }
  .menu-icon {
    display: block;
  }
}

  .form-group {
      position: relative;
  }
  .form-control {
    background: #f7f7f8;
    border: 0;
  }
  .has-feedback .form-control-feedback {
    top: 10px;
  }
  .form-control-feedback {
      position: absolute;
      z-index: 2;
      display: block;
      width: 2.375rem;
      height: 2.375rem;
      line-height: 2.375rem;
      text-align: center;
      pointer-events: none;
      color: #aaa;
      top: 0;
      left: auto;
      right: 0;
  }

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">


<header>
  <nav class="navbar">
    <div class="menu-icon">
      <i class="fa fa-bars fa-2x"></i>
    </div>
    <div class="logo">
      <!-- <img src="mktlogo.jpg"> -->
      <a href="/Morakot/Package" style="color: #FFF;">Morakot Package</a>
    </div>
    <div class="menu">
      <ul>
        <li>
          <div class="form-group has-feedback">
            <input type="text" class="form-control" placeholder="Find a package">
            <span class="fa fa-search form-control-feedback" style=""></span>
          </div>
        </li>
        <li><a href="/Morakot/Upload">Upload</a></li>
        <li><a href="/Morakot/CopyToken">Copy Token</a></li>
        <li><a href="#">Help</a></li>
        <li>
          <!-- Single button -->
          <div class="btn-group dropdown">
            <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                Action <span class="caret"></span>
              </button>
            <ul class="dropdown-menu">
              <li><a href="#">Action</a></li>
              <li><a href="#">Another action</a></li>
              <li><a href="#">Something else here</a></li>
              <li role="separator" class="divider"></li>
              <li><a href="#">Separated link</a></li>
            </ul>
          </div>
        </li>
      </ul>
    </div>
  </nav>

  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

我的风格 sheet 缺少什么才能使我的下拉菜单正常工作？谢谢

Answer 1

如果你想让下拉菜单与主菜单重叠，你可以添加这个css

.menu-icon {
    line-height: 60px;
    width: 100%;
    background: #000;
    text-align: right;
    box-sizing: border-box;
    padding: 15px 24px;
    cursor: pointer;
    color: #fff;
    display: none;
    position: absolute;
    left: 0px;
}

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