CSS学习

date
Apr 10, 2023
slug
css-0
author
status
Public
结合代码

<!DOCTYPE html>
<html>
<head>
<style>
* {
  box-sizing: border-box;
}
/* box-sizing 属性允许我们在框的总宽度（和高度）中包括内边距和边框，确保内边距留在框内而不会破裂。*/

body {
  margin: 0;
}
/*外边距*/

.header {
  background-color: #2196F3;
   /*背景颜色*/
  color: white; 
   /*字体颜色*/
  text-align: center;
   /*文字居中*/
  padding: 15px;
   /*内边距*/
}


.footer {
  background-color: #444;
  color: white;
  padding: 15px;
}

.topmenu {
  list-style-type: none;
  margin: 0;
  padding: 0;
/*用于删除标记/项目符号。请注意，列表还拥有默认的外边距和内边距。要删除此内容，请在 <ul> 或 <ol> 中添加 margin:0 和 padding:0*/

  overflow: hidden;
/*如果使用 hidden 值，溢出会被裁剪，其余内容被隐藏：*/
  background-color: #777;
}

.topmenu li {
  float: left;
/*规定哪些元素可以在清除的元素旁边以及在哪一侧浮动。*/
}

.topmenu li a {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 16px;
  text-decoration: none;
   /* 不带下划线 */
}

.topmenu li a:hover {
  /*鼠标悬浮效果*/
  background-color: #222;
}

.topmenu li a.active {
  /*点击效果*/
  color: white;
  background-color: #4CAF50;
}

.column {
  float: left;
  padding: 15px;
}

.clearfix::after {
/*伪元素*/
  content: "";
  clear: both;
  display: table;
}

.sidemenu {
  width: 25%;
}

.content {
  width: 75%;
}

.sidemenu ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.sidemenu li a {
  margin-bottom: 4px;
  display: block;
  padding: 8px;
  background-color: #eee;
  text-decoration: none;
  color: #666;
}

.sidemenu li a:hover {
  background-color: #555;
  color: white;
}

.sidemenu li a.active {
  background-color: #008CBA;
  color: white;
}
</style>
</head>
<body>

<ul class="topmenu">
  <li><a href="#home" class="active">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a href="#contact">Contact</a></li>
  <li><a href="#about">About</a></li>
</ul>

<div class="clearfix">
  <div class="column sidemenu">
    <ul>
      <li><a href="#flight">The Flight</a></li>
      <li><a href="#city" class="active">The City</a></li>
      <li><a href="#island">The Island</a></li>
      <li><a href="#food">The Food</a></li>
      <li><a href="#people">The People</a></li>
      <li><a href="#history">The History</a></li>
      <li><a href="#oceans">The Oceans</a></li>
    </ul>
  </div>

  <div class="column content">
    <div class="header">
      <h1>The City</h1>
    </div>
    <h1>Chania</h1>
    <p>Chania is the capital of the Chania region on the island of Crete. The city can be divided in two parts, the old town and the modern city.</p>
    <p>You will learn more about responsive web pages in a later chapter.</p>
  </div>
</div>

<div class="footer">
  <p>Footer Text</p>
</div>

</body>
</html>
效果如下