1. 边框圆角
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>边框圆角</title>
<style>
div {
width: 400px;
height: 400px;
border: 2px solid black;
margin: 0 auto;
/* border-radius: 10px; */
/* 正圆 */
/* border-top-left-radius: 100px;
border-top-right-radius: 50px;
border-bottom-right-radius: 20px;
border-bottom-left-radius: 10px; */
/* 椭圆 */
/* border-top-left-radius: 100px 50px;
border-top-right-radius: 50px 25px;
border-bottom-right-radius: 20px 10px;
border-bottom-left-radius: 10px 5px; */
border-radius: 100px 50px 20px 10px / 50px 25px 10px 5px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>2. 边框的外轮廓
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>边框的外轮廓</title>
<style>
.box1 {
width: 400px;
height: 400px;
padding: 10px;
border: 5px solid black;
background-color: gray;
margin: 0 auto;
margin-top: 100px;
/* outline-width: 20px;
outline-color: orange;
outline-style: solid;
outline-offset: 0px; */
/* outline-offset不是outline的子属性 */
outline: 20px orange solid;
}
</style>
</head>
<body>
<div class="box1"></div>
</body>
</html>
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