body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header, footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}

main {
    padding: 1em;
}

h1, h2 {
    margin: 0.5em 0;
}

#news-summaries, #news-sources {
    margin-bottom: 2em;
}

button {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 0.5em 1em;
    cursor: pointer;
}

button:hover {
    background-color: #555;
}

@media (min-width: 600px) {
    main {
        max-width: 800px;
        margin: 0 auto;
    }
}

@media (min-width: 1200px) {
    main {
        max-width: 1200px;
    }
}