使用CSS在导航栏周围设置边框
要在导航栏周围添加边框，请将border设置为<ul>
ul {
border: 2px solid blue;
}示例
您可以尝试运行以下代码来设置边框
<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
width: 200px;
border: 2px solid blue;
}
li a {
display: block;
background-color: #F0E7E7;
}
.active {
background-color: #4CAF50;
color: white;
}
li {
text-align: center;
border-bottom: 1px solid #555;
}
</style>
</head>
<body>
<ul>
<li><a href = "#home">Home</a></li>
<li><a href = "#company" class = "active">Company</a></li>
<li><a href = "#product">Product</a></li>
<li><a href = "#services">Services</a></li>
<li><a href = "#contact">Contact</a></li>
</ul>
</body>
</html>