body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f4f4f4;
  }
  h1, h2 {
    color: #2c3e50;
  }
  .converter {
    background-color: #fff;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }
  input, select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
  }
  button {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  button:hover {
    background-color: #2980b9;
  }
  #result {
    font-weight: bold;
    margin-top: 10px;
  }
  nav {
    background-color: #2c3e50;
    padding: 10px 0;
    margin-bottom: 20px;
  }
  nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }
  nav ul li {
    margin: 5px 10px;
  }
  nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
  }
  nav ul li a:hover, nav ul li a.active {
    background-color: #34495e;
  }
  .converter {
    display: none;
  }
  .converter.active {
    display: block;
  }
  .timezone-container {
    position: relative;
    margin-bottom: 15px;
  }
  .timezone-filter {
    width: 100%;
    padding: 8px;
    margin-bottom: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
  }
  .timezone-select {
    width: 100%;
  }
  footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 15px 0;
    margin-top: 40px;
    width: 100%;
    text-align: center;
  }