body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    color: #333;
}

body > *:not(nav):not(hr) {
    max-width: 900px;
    margin: 20px auto;
    padding: 0 20px;
}

nav {
    background-color: #fff;
    padding: 15px 20px;
    text-align: center;
    border-bottom: 1px solid #ccc;
}

nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #0073e6;
    font-size: 18px;
}

nav a:hover {
    text-decoration: underline;
}

h1 {
    text-align: center;
    color: #222;
    margin-top: 20px;
}

h2 {
    color: #444;
    margin-top: 25px;
}

p {
    line-height: 1.6;
    font-size: 18px;
}

img {
    display: block;
    margin: 20px auto;
    border-radius: 10px;
    max-width: 90%;
    height: auto;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}