我正在使用引导程序如何使用我的 css 文件更改此导航栏的颜色？

Question

I am using bootstrap and I want to change the color of the navbar but I am unable to do it.

Here is the html code for the nav bar

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">TweetyBird</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarText">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Search by Tweet <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Twitter Bot</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">To be added</a>
      </li>
    </ul>
  </div>

</nav>

Here is what I put in my CSS file but the color is still not changing. What do I need to do to be able to change the color?

.navbar{
 background-color: darkslategray;
}

Answer 1

You could do that, but you have to add.important to overwrite current value.

.navbar{
    background-color: darkslategray!important;
}

or use the solution from HuserB1989(Comments)

html .navbar{
    background-color: darkslategray;
}

Answer 2

You might have to make your selector more specific, like in the example below:

.myNavBar {
      background-color: red;
    }

https://jsfiddle.net/example