body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    margin: 20px;
    color: #a01515;
  }
  h1 {
    text-align: center;
    margin-bottom: 30px;
  }
  .a {
    margin-bottom: 20px;
    padding: 15px;
    border-left: 5px solid #a01515;
    background-color: aqua;
    border-radius: 5px;
  }
  .f {
    color: blue;
    margin-top: 5px;
  }