body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
  }
  
  .accordion {
    max-width: 600px;
    margin: 50px auto;
  }
  
  .menu {
    list-style: none;
    padding: 0;
  }
  
  .group {
    background-color: #fff;
    color: #013c82;
    cursor: pointer;
    padding: 10px;
    margin: 5px 0;
    font-weight: bold;
  }
  
  .sub-menu {
    list-style: none;
    padding: 0;
    display: none;
  }
  
  .sub-menu li {
    background-color: #f4f4f4;
    color: #013c82;
    padding: 10px;
    margin: 5px 0;
    cursor: pointer;
    font-weight: normal;
  }