body {
      /*font-family: sans-serif;
      background: #f9f9f9;
      padding: 40px;*/
    }
    .container2 {
      max-width: 600px;
      background: #fff;
      padding: 32px;
      margin: 0 auto;
      border-radius: 8px;
      box-shadow: 0 0 1px #333333;
    }
    .calc-title {
      margin-top: 0;
      font-size: 24px;
      color: #222;
      font-weight: bold;
    }
    label {
      display: block;
      margin: 16px 0 6px;
      font-weight: bold;
    }
    input {
      width: 100%;
      padding: 10px;
      font-size: 16px;
      border: 1px solid #ccc;
      border-radius: 4px;
    }
    button {
      margin-top: 20px;
      background: #9a9a9a;
      color: #fff;
      border: none;
      padding: 12px 20px;
      font-size: 16px;
      border-radius: 4px;
      cursor: pointer;
    }
    .result {
      margin-top: 30px;
      background: #fbf9f9;
      padding: 20px;
      border-radius: 6px;
      line-height: 1.6;
    }