body {
       font-family: Arial, sans-serif;
       margin: 0;
       padding: 0;
       background-color: #f4f4f4;
   }

   header {
       background-color: #333;
       color: #fff;
       padding: 10px 20px;
       display: flex;
       justify-content: space-between;
       align-items: center;
   }

   .logo img {
       height: 50px;
   }

   nav ul {
       list-style: none;
       margin: 0;
       padding: 0;
   }

   nav ul li {
       display: inline;
       margin-left: 20px;
   }

   nav ul li a {
       color: #fff;
       text-decoration: none;
   }

   main {
       padding: 20px;
       text-align: center;
   }

   footer {
       background-color: #333;
       color: #fff;
       text-align: center;
       padding: 10px 20px;
       position: fixed;
       width: 100%;
       bottom: 0;
   }