body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

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

main {
    padding: 20px;
    max-width: 900px;
    margin: 20px auto;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

#article-list ul {
    list-style: none;
    padding: 0;
}

#article-list li {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    background-color: #f9f9f9;
    cursor: pointer;
}

#article-list li:hover {
    background-color: #e9e9e9;
}

#article-detail button {
    background-color: #007bff;
    color: #fff;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
    margin-bottom: 20px;
}

#article-detail button:hover {
    background-color: #0056b3;
}

#article-content img {
    max-width: 100%;
    height: auto;
}