.navbar {
    width: 100%;
    background-color: #f8f9fa;
  }
  
  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    width: 100%;
  }
  
  .title a {
    text-decoration: none;
    color: #343a40;
  }
  
  .expand-button {
    width: 15px;
    height: 15px;
    padding: 5px;
    font-size: 10px;
    position: relative;
    cursor: pointer;
    margin-right: 15px;
  }
  
  .expand-button span {
    background-color: #343a40;
    height: 2px;
    width: 100%;
    position: absolute;
    left: 50%;
    transform-origin: center;
    transition: transform 0.3s ease;
  }
  
  .expand-button span:first-child {
    top: 50%;
    transform: translateX(-50%);
  }
  
  .expand-button span:last-child {
    top: 50%;
    transform: translateX(-50%) rotate(90deg);
  }
  
  .expand-button.open span:first-child {
    transform: translateX(-50%) rotate(180deg);
  }
  
  .expand-button.open span:last-child {
    transform: translateX(-50%) rotate(180deg);
  }
  
  .content {
    max-height: 0;
    visibility: hidden;
    overflow: hidden;
    transition: max-height 0.3s ease, visibility 0.3s ease, margin 0.3s ease;
    padding-top: 10px;
    list-style: none;
    padding-left: 0;
    margin: 0 auto;
  }