<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
#mySidenav a { position: absolute;
left: -80px;
transition: 0.3s;
padding: 15px;
width: 100px;
text-decoration: none;
font-size: 20px;
color: white;
border-radius: 0 5px 5px 0;
}
#mySidenav a:hover { left: 0;
}
#about { top: 20px;
background-color: #4CAF50;
}
#blog { top: 80px;
background-color: #2196F3;
}
#projects { top: 140px;
background-color: #f44336;
}
#contact { top: 200px;
background-color: #555
}
</style>
</head>
<body>
<div id="mySidenav" class="sidenav">
<a href="#" id="about">About</a>
<a href="#" id="blog">Blog</a>
<a href="#" id="projects">Projects</a>
<a href="#" id="contact">联系方式</a>
</div>
<div style="margin-left:80px;">
<h2>悬停侧边栏按钮</h2>
<p>将鼠标悬停在左侧导航中的按钮上以打开它们。</p>
</div>
</body>
</html>