<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>css</title>
</head>
<body>
<style>
#a {
width: 150px;
height: 300px;
background: radial-gradient(circle at top left,
transparent 15px, #e6e4b7 0) top left,
radial-gradient(circle at top right,
transparent 15px, #e6e4b7 0) top right,
radial-gradient(circle at bottom right,
transparent 15px, #e6e4b7 0) bottom right,
radial-gradient(circle at bottom left,
transparent 15px, #e6e4b7 0) bottom left;
background-size: 50% 50%;
background-repeat: no-repeat;
padding: 20px 24px 22px 20px;
filter: drop-shadow(2px 2px 10px red);
}
#b {
display: block;
background: radial-gradient(circle at top left,
transparent 15px, red 0) top left,
radial-gradient(circle at top right,
transparent 15px, red 0) top right,
radial-gradient(circle at bottom right,
transparent 15px, red 0) bottom right,
radial-gradient(circle at bottom left,
transparent 15px, red 0) bottom left;
background-size: 50% 50%;
background-repeat: no-repeat;
width:100%;
height: 100%;
padding: 2px;
}
#b:before {
content: "";
width: 100%;
height: 100%;
display: block;
background: radial-gradient(circle at top left,
transparent 15px, #e6e4b7 0) top left,
radial-gradient(circle at top right,
transparent 15px, #e6e4b7 0) top right,
radial-gradient(circle at bottom right,
transparent 15px, #e6e4b7 0) bottom right,
radial-gradient(circle at bottom left,
transparent 15px, #e6e4b7 0) bottom left;
background-size: 50% 50%;
background-repeat: no-repeat;
}
</style> <div id="a">
<div id="b"></div>
</div>
</body>
</html>
内凹圆角的实现
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background: radial-gradient(circle at top left, transparent 15px, #58a 0) top left,
radial-gradient(circle at top right, transparent 15px, #58a 0) top right,
radial-gradient(circle at bottom left, transparent 15px, #58a 0) bottom left,
radial-gradient(circle at bottom right, transparent 15px, #58a 0) bottom right;
background-repeat: no-repeat;
background-size: 50% 50%;
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