html - 如何使边界重叠？ | 如何使边界重叠

我正在尝试使标题的边框顶部具有一种颜色，并且当悬停/激活导航时，它的一部分会变为另一种颜色。

以及为什么对于li:hover标签，当我执行border-top时仍返回border-bottom吗？

What I'm trying to achieve in a picture
如前所述，我还希望在hover上，边框过渡位于图片中绿色边框线的上方。

我怎样才能做到这一点？

这是我到目前为止的

/*** Page ***/
html,body {
    margin: 0;
}

/*** Navigation ***/
.navbar {
    background-color: #ecf0f1;
}
.navbar > .main-nav > ul,
li {
    list-style-type: none;
    text-decoration: none;
}
.navbar > .main-nav > ul {
    min-height: 60px;
    margin: 0;
    padding: 0;
    overflow: hidden;
    box-sizing: border-box;
    border-top: 8px solid #d1d064;
}
.navbar > .main-nav > ul > li {
    text-align: center;
    min-width: 150px;
    position: relative;
    top: -2px;
    display: block;
    float: left;
}
.navbar > .main-nav > ul > li a {
    display: block;
    color: #737373;
    text-align: center;
    padding: 20px 16px;
    text-decoration: none;
    font-family: 'Lato', sans-serif;
    font-weight: 800;
}
.navbar > .main-nav > ul > li.active {
    border-top: 8px solid #0F9E5E;
}
.navbar > .main-nav > ul > li:after {
    display: block;
    content: '';
    border-top: solid 3px #a8a8b6;
    transform: scaleX(0);
    transition: transform 250ms ease-in-out;
}
.navbar > .main-nav > ul > li:hover:after {
    transform: scaleX(1);
}
.navbar > .main-nav {
    max-width: 1480px;
    margin: 0 auto;
}

<link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/hover.css/2.1.0/css/hover-min.css" rel="stylesheet">
</head>

<body>
<br><br><br><br><br><br>
    <nav class="navbar">
        <div class="main-nav">
            <ul>
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">Second</a></li>
                <li><a href="#">Third</a></li>
            </ul>
        </div>
    </nav>
</body>

谢谢

最佳答案

边框会影响布局，我建议您只需切换到box-shadow即可更改颜色:

.navbar > .main-nav > ul > li.active,
.navbar > .main-nav > ul > li:hover {
  box-shadow: 0 -8px 0 #0F9E5E;
}

工作演示:

.navbar {
  background-color: #ecf0f1;
}
.navbar::after {
  content: '';
  clear: both;
  display: block;
}
.navbar > .main-nav > ul,
li {
  list-style-type: none;
  text-decoration: none;
}
.navbar > .main-nav > ul {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border-top: 8px solid #d1d064;
}
.navbar > .main-nav > ul > li {
  text-align: center;
  min-width: 150px;
  position: relative;
  display: block;
  float: left;
}
.navbar > .main-nav > ul > li a {
  display: block;
  color: #737373;
  text-align: center;
  padding: 20px 16px;
  text-decoration: none;
  font-family: 'Lato', sans-serif;
  font-weight: 800;
}
.navbar > .main-nav > ul > li.active,
.navbar > .main-nav > ul > li:hover {
  box-shadow: 0 -8px 0 #0F9E5E;
}

<br>
<br>
<br>
<nav class="navbar">
  <div class="main-nav">
    <ul>
      <li class="active"><a href="#">Home</a>
      </li>
      <li><a href="#">Second</a>
      </li>
      <li><a href="#">Third</a>
      </li>
    </ul>
  </div>
</nav>

这是由以下CSS引起的:

.navbar > .main-nav > ul > li:after {
  display: block;
  content: '';
  border-top: solid 3px #a8a8b6;
  transform: scaleX(0);
  transition: transform 250ms ease-in-out;
}

.navbar > .main-nav > ul > li:hover::after {
  transform: scaleX(1);
}

关于html - 如何使边界重叠？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41205415/