Question

我刚刚安装了引导导航，但是在尝试响应式设计时，下拉菜单正在工作，它首先显示为黑色，但随后突然变为白色（仅在下拉菜单完成打开之后），我尝试了所有我找不到的方法要修复它，似乎我只能更改按钮的背景颜色，谢谢您的帮助。

When opening it's black then it becomes white like this

CSS

  body {
  background-color: #f1f2f6;
}

.logo {
  width: 50%;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

#header-color {
  background-color: #ffffff;
}

.navbar-nav.navbar-center {
    position: absolute;
    left: 50%;
    transform: translatex(-50%);
}

#jpflag {
  width: 20px;
  height: 15px;
  vertical-align: middle;
}

HTML

<!DOCTYPE html>
<html>
<head>
    <title>Pandaberu - パンダベル</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
</head>

<body>

    <header>

    <!-- Logo -->
<div id="header-color">
    <div class="logocontainer">
        <img src="./images/logo.png" class="logo img-fluid" alt="Pandaberu logo">
    </div>

    <!-- Navigation -->
        <nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>
      <!-- <a class="navbar-brand" href="#">WebSiteName</a> -->
    </div>
    <div class="collapse navbar-collapse text" id="myNavbar">
      <ul class="nav navbar-nav navbar-center">
        <li class="active"><a href="index.html">Home</a></li>
        <li><a href="#">Japanese</a></li>
        <li><a href="#">About me</a></li>
        <li><a href="#">Contact</a></li>
        <li><a href="#"><img src="./images/jpflag.png" alt="Nihongo" id="jpflag"></a></li>
      </ul>
<!--       <ul class="nav navbar-nav navbar-right">
        <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
        <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
      </ul> -->
    </div>
  </div>
</nav>

</div>

  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>

    </header>


</body>

</html>

Bootstrap下拉列表变为白色

0 个答案: