CSS outline 与 border-radius

<html>
  <head>
    <meta charset="utf-8">
    <title>outline 与 border-radius</title>
    <style>
      .radius-box {
        width: 200px;
        height: 100px;
        background-color: #f0f0f0;
        border: 2px solid #333;
        margin: 20px;
        padding: 15px;
        display: inline-block;
      }
      
      /* 圆角元素，outline 会跟随圆角 */
      .rounded {
        border-radius: 20px;
        outline: 4px solid #0066ff;
      }
      
      /* 大圆角 */
      .large-radius {
        border-radius: 50px;
        outline: 4px solid #ff6600;