史上最全的css布局教程（详解CSS经典布局之Sticky footer布局）

<li class="detail">
     <li class="wrapper clearfix">
       <li class="title">
        <h1>这里是头部</h1>
       </li>
       <li class="main">
        <p>这里是main content区域...</p>
        <p>这里是main content区域...</p>
        <p>这里是main content区域...</p>
        <p>这里是main content区域...</p>
       </li>
     </li>
     <li class="footer">
       <p>© 2017 No rights reserved.</p> 
    <p>Made with ♥ by an anonymous pastafarian.</p> 
     </li>
  </li>

li,h1,p{margin:0; padding: 0;}
 .detail{
      position:fixed;
      overflow:auto;
      width:100%;
      height:100%;
    }
 .wrapper{
      min-height:100%;
      width:100%;
    }
 .title h1{
      font-size:40px;
      text-align: center;
    }
 .main{
      margin-top:64px;
      padding-bottom:64px;
    }
 .main p{
      font-size: 25px; 
      text-align: center;
    }
 .footer{
      margin:-64px auto 0 auto;
      font-size:32px;
    }
 .footer p{
      text-align: center;
    }
 .clearfix::after {
      display: block;
      content: ".";
      height: 0;
      clear: both;
      visibility: hidden;
    }

<header> 
      <h1>Site name</h1> 
  </header> 
  <li class="main"> 
      <p>Bacon Ipsum dolor sit amet...</p> 
      <p>Bacon Ipsum dolor sit amet...</p>
      <p>Bacon Ipsum dolor sit amet...</p>
      <p>Bacon Ipsum dolor sit amet...</p>
  </li> 
  <footer> 
      <p>© 2017 No rights reserved.</p> 
      <p>Made with ♥ by an anonymous pastafarian.</p> 
  </footer>

body{display: flex; flex-flow: column; min-height: 100vh; overflow:auto;}
    h1{font-size: 60px; text-align: center;}
    p{font-size: 24px; text-align: center;}
   .main{flex:1;}