边框内圆角效果
方法一：div嵌套法
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>边框内圆角</title>
<link rel="stylesheet" href="">
<style>
.box {
width: 300px;
height: 100px;
background: rgb(107,89,86);
position: relative;
}
.inner-box {
background: rgb(216,193,187);
position: absolute;
top: 10px;
bottom: 10px;
right: 10px;
left: 10px;
border-radius: 10px;
}
</style>
</head>
<body>
<div class="box">
<div class="inner-box"></div>
</div>
</body>
</html>
方法二：ouline与box-shadow
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>边框内圆角</title>
<link rel="stylesheet" href="">
<style>
.box {
width: 300px;
height: 100px;
margin: 20px;
background: tan;
outline: 10px solid #655;
border-radius: 10px;
box-shadow: 0 0 0 10px #655;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
方法三：伪元素法
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>边框内圆角</title>
<link rel="stylesheet" href="">
<style>
.box {
width: 300px;
height: 100px;
background: rgb(216,193,187);
border-radius: 20px;
padding: 10px;
background-clip: content-box;
position: relative;
}
.box::before {
content: '';
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: rgb(107,89,86);
z-index: -1;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
