img {
    width: 100% ;
    }
    
    body {
        font-family: Arial, sans-serif;
    }
    header, footer {
        background-color: #333;
        color: white;
        padding: 10px;
    }
    header ul, footer ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }
    header li, footer li {
        display: inline-block;
        margin-right: 10px;
    }
    header a, footer a {
        color: white;
        text-decoration: none;
        font-size: 25px;
    }
    header a:hover, footer a:hover {
        background-color: greenyellow;
        color: black;
    }
    main {
        max-width: 800px;
        margin: 0 auto;
        padding: 20px;
    }
    article {
        background-color: #f4f4f4;
        padding: 10px;
        margin-bottom: 20px;
    }
    article:hover {
        box-shadow: 0 0 10px rgba(0,0,0,0.5);
    }
    article a {
        font-family: "Courier New", Courier, monospace;
        display: inline-block;
        background-color: #333;
        color: white;
        padding: 0.5em 1em;
    }
    
    article a:hover {
    background-color: #111;
    }
footer ul {
    text-align: center;
}
footer li {
    display: inline-block;
    margin: 10px;
}