body, ul {
    margin: 0;
    padding: 10px;
  }
  nav {
    background-color: #333;
  } 
  .nav-menu {
    display: flex;
    list-style-type: none;
    justify-content: center;
  }
  .nav-menu li {
    margin: 0 20px;
  } 
  .nav-menu a {
    color: white;
    font-size: 18px;
    padding: 10px 15px;
  }
  .nav-menu a:hover {
    background-color: #555;
    border-radius: 5px;
  }