* {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Roboto', sans-serif;
      color: #333;
      background: #f9f9f9;
    }
    header {
      background: url('images/header.jpg') no-repeat center center/cover;
      padding: 80px 20px;
      text-align: center;
      color: white;
    }
    header h1 {
      font-size: 2.5rem;
      margin: 0;
    }
    header p {
      font-size: 1.2rem;
    }
    nav {
      background: #00796b;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
    }
    nav a {
      color: white;
      padding: 15px 20px;
      text-decoration: none;
      font-weight: bold;
    }
    nav a:hover {
      background: #004d40;
    }
    .container {
      display: flex;
      flex-wrap: wrap;
      padding: 20px;
      gap: 20px;
      max-width: 1200px;
      margin: auto;
    }
    .main {
      flex: 2;
      background: white;
      padding: 20px;
      border-radius: 5px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }
    .sidebar {
      flex: 1;
      min-width: 300px;
      background: white;
      padding: 20px;
      border-radius: 5px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }
    footer {
      text-align: center;
      padding: 20px;
      background: #eeeeee;
      font-size: 0.9rem;
      color: #777;
    }
    iframe {
      width: 100%;
      height: 250px;
      border: none;
    }
    h2 {
      color: #00796b;
    }
    ul {
      padding-left: 20px;
    }
	.responsive-img {
    width: 100%;
    height: auto;
    max-width: 480px;
    display: block;
    margin: 1em 0;
  }