Bootstrap 导航栏填充答案

【问题标题】：Bootstrap Navbar paddingBootstrap 导航栏填充
【发布时间】：2021-04-12 20:02:16
【问题描述】：

我的引导导航栏如下所示：当我将鼠标悬停在每个 LOREM 上时，它看起来像这样：如何修改我的代码，使 LOREM 在导航栏的顶部和底部具有相等的间距，如下所示：

请注意，下划线必须保持原样。我只需要 LOREM 在没有悬停时具有相等的间距。这是我的 HTML 和 CSS 代码：

<!DOCTYPE html>
<html>
   <head>
       <title>Bootstrap Resize</title>
       <meta charset="utf-8"></meta>
       <meta name="viewport" content="width=device-width, initial-scale=1" ></meta>
       <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" />
       <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
   </head>

   <style type="text/css">
    .navbar-custom { 
    background-color: #484848;
    }

    ul.ml-auto > li > a > span{
    font: 15px Roboto,sans-serif;
    font-weight: 500;
    position: relative;
    display: inline-block;
    color: #FFFFFF80;
    overflow: hidden;
    padding-bottom: 5px;
    }
    ul.ml-auto > li > a > span::before {
    position: absolute;
    content: attr(data-content);
    color: #00FFFF;
    clip-path: polygon(0 0, 0 0, 0% 100%, 0 100%);
    transition: clip-path 275ms ease;
    display: block;
    border-bottom: 2px solid #00FFFF;
    padding-bottom: 4px;
    }
    ul.ml-auto > li > a > span:hover::before {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
   </style>

   <body>                 
    <nav class="navbar navbar-custom navbar-expand-lg navbar-dark fixed-top py-2" id="mainNav">
      <div class="container">
        <a  style="font: 20px Arial,sans-serif" class="navbar-brand js-scroll-trigger" href="#">HOME</a>
        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarResponsive">
          <ul style="font: 15px Roboto,sans-serif" class="navbar-nav ml-auto">
            <li class="nav-item">
              <a class="nav-link js-scroll-trigger" href="#about"><span data-content="LOREM">LOREM</span></a>
            </li>
            <li class="nav-item">
              <a class="nav-link js-scroll-trigger" href="#expertise"><span data-content="LOREM">LOREM</span></a>
            </li>
            <li class="nav-item">
              <a class="nav-link js-scroll-trigger" href="#portfolio"><span data-content="LOREM">LOREM</span></a>
            </li>
            <li class="nav-item">
              <a class="nav-link js-scroll-trigger" href="#contact"><span data-content="LOREM">LOREM</span></a>
            </li>
          </ul>
        </div>

      </div>
    </nav>
   </body>
</html>

【问题讨论】：

标签： html css bootstrap-4 frontend

【解决方案1】：

您只需要删除overflow 和padding-bottom 就可以了

ul.ml-auto > li > a > span {
    font: 15px Roboto,sans-serif;
    font-weight: 500;
    position: relative;
    display: inline-block;
    color: #FFFFFF80;
}

现场演示：

.navbar-custom {
  background-color: #484848;
}

ul.ml-auto>li>a>span {
  font: 15px Roboto, sans-serif;
  font-weight: 500;
  position: relative;
  display: inline-block;
  color: #FFFFFF80;
}

ul.ml-auto>li>a>span::before {
  position: absolute;
  content: attr(data-content);
  color: #00FFFF;
  clip-path: polygon(0 0, 0 0, 0% 100%, 0 100%);
  transition: clip-path 275ms ease;
  display: block;
  border-bottom: 2px solid #00FFFF;
  padding-bottom: 4px;
}

ul.ml-auto>li>a>span:hover::before {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

<!DOCTYPE html>
<html>

<head>
  <title>Bootstrap Resize</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" />
</head>

<body>
  <nav class="navbar navbar-custom navbar-expand-lg navbar-dark fixed-top py-2" id="mainNav">
    <div class="container">
      <a style="font: 20px Arial,sans-serif" class="navbar-brand js-scroll-trigger" href="#">HOME</a>
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>

      <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul style="font: 15px Roboto,sans-serif" class="navbar-nav ml-auto">
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#about"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#expertise"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#portfolio"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#contact"><span data-content="LOREM">LOREM</span></a>
          </li>
        </ul>
      </div>

    </div>
  </nav>
</body>

</html>

【讨论】：

【解决方案2】：

调整a标签的内边距

.navbar-custom { 
  background-color: #484848;
}

ul.ml-auto > li > a > span{
  font: 15px Roboto,sans-serif;
  font-weight: 500;
  position: relative;
  display: inline-block;
  color: #FFFFFF80;
  overflow: hidden;
  padding-bottom: 5px;
}
ul.ml-auto > li > a > span::before {
  position: absolute;
  content: attr(data-content);
  color: #00FFFF;
  clip-path: polygon(0 0, 0 0, 0% 100%, 0 100%);
  transition: clip-path 275ms ease;
  display: block;
  border-bottom: 2px solid #00FFFF;
  padding-bottom: 4px;
}
ul.ml-auto > li > a > span:hover::before {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}
.nav-link {
  padding: .5rem 1rem 0;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>

<nav class="navbar navbar-custom navbar-expand-lg navbar-dark fixed-top py-2" id="mainNav">
    <div class="container">
      <a  style="font: 20px Arial,sans-serif" class="navbar-brand js-scroll-trigger" href="#">HOME</a>
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

      <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul style="font: 15px Roboto,sans-serif" class="navbar-nav ml-auto">
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#about"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#expertise"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#portfolio"><span data-content="LOREM">LOREM</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link js-scroll-trigger" href="#contact"><span data-content="LOREM">LOREM</span></a>
          </li>
        </ul>
      </div>
    </div>
</nav>

【讨论】：

【解决方案3】：

原因是 span 标签的底部填充。您只应用了底部填充。

解决方案- 在顶部和底部应用相等的填充。正如我在下面申请的那样。

 ul.ml-auto > li > a > span {
 font: 15px Roboto,sans-serif;
 font-weight: 500;
 position: relative;
 display: inline-block;
 color: #FFFFFF80;
 overflow: hidden;
 padding-bottom: 5px;
 padding-top: 5px;/*New added for equal space*/
}

【讨论】：