Bootstrap 導航欄鏈接顏色不會改變

Question

我需要將我的導航欄鏈接更改為白色並將它們隔開整個導航欄。 我已經為此編寫了代碼，但我似乎無法弄清楚為什么/在哪里它一直被覆蓋。 導航欄的背景是一張圖片，如果沒有圖片，鏈接似乎會變成白色，那么有沒有辦法解決這個問題並將圖片保留在背景中？

誰能幫我理解我做錯了什么？

 .navbar { background-image: url("images/navbarbgnew.png"); background-size: cover; margin: -30px 0 15px 0; }.navbar ul { display: flex; justify-content: space-around; }.navbar ul li a { color: #FFF; font-family: "Helvetica," sans-serif; font-weight: 600; font-size: 14px; }

 <nav class="navbar navbar-expand-md navbar-light bg-light mb-3"> <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="nav navbar-nav"> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> BOOKS </a> <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> <a class="dropdown-item" href="#">Branding Sutra</a> </div> </li> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> LEARNING LAB </a> <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> <a class="dropdown-item" href="#">Workshops</a> <a class="dropdown-item" href="#">Classes</a> <a class="dropdown-item" href="#">Audio Downloads</a> </div> </li> <li class="nav-item"> <a class="nav-link" href="#">SERVICES</a> </li> </ul> </div> </nav>

Answer 1

誰能幫我理解我做錯了什么？

自定義css規則的特殊性必須匹配或超過相應的Bootstrap規則的特異性 。

因此，在這種特殊情況下，您需要一個如下所示的規則：

.navbar-light .navbar-nav .nav-link {
    color: red;
}

點擊下面的“運行代碼段”按鈕，然后展開到整頁以驗證其是否有效：

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> <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/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> <style> .navbar-light .navbar-nav .nav-link { color: red; } </style> <nav class="navbar navbar-expand-md navbar-light bg-light mb-3"> <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="nav navbar-nav"> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> BOOKS </a> <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> <a class="dropdown-item" href="#">Branding Sutra</a> </div> </li> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> LEARNING LAB </a> <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> <a class="dropdown-item" href="#">Workshops</a> <a class="dropdown-item" href="#">Classes</a> <a class="dropdown-item" href="#">Audio Downloads</a> </div> </li> <li class="nav-item"> <a class="nav-link" href="#">SERVICES</a> </li> </ul> </div> </nav> 

有關CSS特異性的更多信息：

https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

並且： CSS特異性計算器

Answer 2

只需刪除 class= navbar-light;