blur与contrast添加圆角.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    div {
      position: relative;
      width: 250px;
      height: 250px;
      filter: contrast(20);
      background-color: #fff;
      overflow: hidden;
    }

    div::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
      filter: blur(7px);
      border: 25px solid transparent;
      border-bottom: 25px solid #000;
      border-radius: 50%;
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>