#wrapper {
            border: thin solid green; 
            width: 80%;
            margin-left: auto;
            margin-right: auto;
        }
        header {
            border: thick solid red;
            padding: 10px;
        }
        nav {
            display: flex;
        }
        nav > div {
            border: Thick solid blue;
            padding: 8px;
            font-size: 1.5em;
        }
        main {
            border: thin solid red;
        }
        main > h2 {
            text-decoration:underline;
        }
        footer {
            font-style: italic;
            text-align: center;
        }