CSS下拉导航右对齐

<ul class="navbar">
  <li><a href="#">首页</a></li>
  <li>
    <a href="#">产品</a>
    <ul class="dropdown">
      <li><a href="#">产品1</a></li>
      <li><a href="#">产品2</a></li>
      <li><a href="#">产品3</a></li>
    </ul>
  </li>
  <li><a href="#">关于我们</a></li>
</ul>

.navbar {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #f1f1f1;
}

.navbar li {
  float: right;
}

.navbar li a {
  display: block;
  color: #333;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.navbar li a:hover {
  background-color: #ddd;
}

.dropdown {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

.dropdown li {
  float: none;
}

.dropdown li a {
  padding: 12px 16px;
  color: #333;
  text-decoration: none;
  display: block;
  text-align: right;
}

.navbar li:hover .dropdown {
  display: block;
}