html - Bootstrap 汉堡菜单图标栏不会改变颜色

Question

我正在尝试将汉堡菜单图标栏更改为白色。但它没有改变。如何更改图标栏颜色？我认为它停留在默认颜色。

html

<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-
        toggle="collapse" data-target="#myNavbar" aria-expanded="false" 
        aria-controls="navbar">

        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>

      </button>
    <a class="navbar-brand" href="#myPage">WASHINGTOWN</a>
</div>
</div>
</nav>

CSS

navbar-default .navbar-toggle,
.navbar-default, span.icon-bar {
color: white !important;
}

Answer 1

.navbar-default .navbar-toggle .icon-bar {
    background-color: #fff !important;;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  
  <nav class="navbar navbar-default navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-
        toggle="collapse" data-target="#myNavbar" aria-expanded="false" 
        aria-controls="navbar">

        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>

      </button>
    <a class="navbar-brand" href="#myPage">WASHINGTOWN</a>
</div>
</div>
</nav>