<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>圆角渐变</title>
<style>
body {
background-color: #3E5D6A;
}
.border3{
margin: 50px;
width: 220px;
height: 120px;
border: 2px solid transparent;
border-radius: 16px;
background-clip: content-box, border-box;
background-origin: content-box, border-box;
background-image: linear-gradient(to right, #3E5D6A, #3E5D6A), linear-gradient(163deg, rgba(255, 255, 255, 0.6), #537280, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.1));
}
</style>
</head>
<body>
<div class="border3"></div>
</body>
</body>
</html>
