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css - 修复了手机上的导航栏

问题描述

我试图让我的导航栏仅在用户在移动设备上访问该网站时固定在顶部。到目前为止，我已经尝试通过使用媒体查询来做到这一点。当我使用 Google chrome 功能“检查”来查看我的网站在移动设备上的外观时，它可以工作，但是当我上传网站并从实际的移动设备访问它时，导航栏不再固定在顶部。 链接到该网站

更新：固定的导航栏在 safari 中根本不起作用，并且在 google chrome 中放置在错误的位置 

<!--NAVIGATION BAR-->
<!DOCTYPE html>

   <nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

 <div class="collapse navbar-collapse" id="navbarSupportedContent">
   <ul class="navbar-nav mr-auto">
  <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </a>
    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <div class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a>
  </li>
</ul>
<form class="form-inline my-2 my-lg-0">
  <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
  <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
CSS


 @media only screen and (max-width: 768px) {
     .navbar {
         position: fixed;
         z-index: 1;
         width: 100%;
     }
 }

 @media only screen and (max-width: 768px) {
     .carousel {
         margin-top: 60px;
     }
 }

 .navbar {
     background-color: #2A2F35;
     padding: 0 !important;
 }

 .navbar-nav a {
     font-family: 'Open Sans', sans-serif;
     font-style: normal;
     font-size: 14px;
     font-weight: 400;
     line-height: 22px;
     letter-spacing: 0.5px;
     color: #ffffff !important;
     padding: 25px 0px 25px 0px;
     margin: 0px 15px 0px 15px;

}

标签： cssbootstrap-4media-queries

解决方案

以此为参考

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

 <div class="collapse navbar-collapse" id="navbarSupportedContent">
   <ul class="navbar-nav mr-auto">
  <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </a>
    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <div class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a>
  </li>
</ul>
<form class="form-inline my-2 my-lg-0">
  <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
  <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>

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