body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    }
    
    header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
    }
    
    h1 {
    margin: 0;
    }
    
    nav {
    background-color: #ccc;
    padding: 10px;
    }
    
    nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    }
    
    nav li {
    margin-right: 10px;
    }
    
    nav a {
    color: #333;
    text-decoration: none;
    }
    
    main {
    padding: 20px;
    }
    
    form {
    margin-bottom: 20px;
    }
    
    label {
    display: block;
    margin-bottom: 5px;
    }
    
    input[type="text"] {
    padding: 5px;
    width: 100%;
    box-sizing: border-box;
    }
    
    input[type="submit"] {
    padding: 5px 10px;
    background-color: #333;
    color: white;
    border: none;
    }

    h2, h3 {
        margin-bottom: 5px;
        }