要添加圆角边框，请使用border-radius属性。对于top / left left，请使用border-top-left-radius属性；对于bottom，请使用 border-bottom-left-radius。以相同的方式，设置右上/右下。
您可以尝试运行以下代码向分页中的第一个和最后一个链接添加圆角边框-
<!DOCTYPE html>
<html>
<head>
<style>
.demo {
display: inline-block;
}
.demo a {
color: red;
padding: 5px 12px;
text-decoration: none;
transition: background-color 2s;
border: 1px dashed orange;
}
.demo a.active {
background-color: red;
color: white;
border-radius: 5px;
}
.demo a:hover:not(.active) {
background-color: yellow;
}
.demo a:first-child {
border-top-left-radius: 10px;
border-bottom-left-radius: 10px;
}
.demo a:last-child {
border-top-right-radius: 10px;
border-bottom-right-radius: 10px;
}
</style>
</head>
<body>
<h2>Our Quizzes</h2>
<div class = "demo">
<a href = "prev.html"></a>
<a href = "quiz1.html">Quiz1</a>
<a href = "quiz2.html">Quiz2</a>
<a href = "quiz3.html" class = "active">Quiz3</a>
<a href = "quiz4.html">Quiz4</a>
<a href = "next.html">></a>
</div>
</body>
</html>