.cta-button,header nav ul li a {
    display: inline-block;
    text-decoration: none;
}

body {
    font-family: Arial, sans-serif;
    background: #f4f4f9;
    max-width: 900px;
    margin: 0 auto;
    padding: 1em;
}

header nav ul {
    list-style-type: none;
    overflow: hidden;
    background-color: #333;
    padding: 0;
    text-align: center;
}

header nav ul li {
    display: inline;
    margin-right: 15px;
}

header nav ul li a {
    color: #fff;
    padding: 14px 20px;
}

header nav ul li a:hover {
    background-color: #bbb;
    color: #000;
}

main {
    background: #fff;
    padding: 20px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

article h1 {
    font-size: 2.2em;
    color: #444;
}

.author-date {
    color: #777;
    font-style: italic;
    margin-bottom: 1em;
}

article img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 20px;
}

article section h2 {
    font-size: 1.5em;
    color: #444;
}

article section p {
    line-height: 1.6;
    margin-bottom: 1em;
    text-align: justify;
}

footer {
    font-size: 0.8em;
    text-align: center;
    clear: both;
    padding-top: 20px;
}

.cta-button {
    padding: 10px 20px;
    background-color: #007acc;
    color: #fff;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #005fa0;
}