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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 
<style>
ul.pagination {
    display: inline-block;
    padding: 0;
    margin: 0;
}
ul.pagination li {display: inline;}
ul.pagination li a {
    color: black;
    float: left;
    padding: 8px 16px;
    text-decoration: none;
    transition: background-color .3s;
    border: 1px solid #ddd;
}
.pagination li:first-child a {
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
}
.pagination li:last-child a {
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
}
ul.pagination li a.active {
    background-color: #4CAF50;
    color: white;
    border: 1px solid #4CAF50;
}
ul.pagination li a:hover:not(.active) {background-color: #ddd;}
</style>
<h2>圆角边框</h2>
<ul class="pagination">
  <li><a href="#">«</a></li>
  <li><a href="#">1</a></li>
  <li><a class="active" href="#">2</a></li>
  <li><a href="#">3</a></li>
  <li><a href="#">4</a></li>
  <li><a href="#">5</a></li>
  <li><a href="#">6</a></li>
  <li><a href="#">7</a></li>
  <li><a href="#">»</a></li>
</ul>
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代码编辑器：

运行结果：