body {
    font-family: 'Times New Roman', serif;
    margin: 0;
    padding: 30px;
    background-color: #e8ecef;
    color: #222;
}
header {
    text-align: center;
    margin-bottom: 30px;
}
header h1 {
    font-size: 2.5em;
    margin: 0;
}
nav {
    margin-top: 10px;
}
nav a {
    color: #005555;
    text-decoration: none;
    margin: 0 10px;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
}
main {
    max-width: 1000px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
section {
    margin-bottom: 30px;
}
h2 {
    color: #005555;
    font-size: 1.8em;
    border-bottom: 2px solid #005555;
    padding-bottom: 5px;
}
p {
    line-height: 1.8;
}
a {
    color: #005555;
    text-decoration: none;
    font-weight: bold;
}
a:hover {
    text-decoration: underline;
}
code {
    background-color: #f4f4f4;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}
footer {
    text-align: center;
    margin-top: 30px;
}
#topButton {
    padding: 12px 24px;
    font-size: 1.1em;
    background-color: #005555;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
#topButton:hover {
    background-color: #003d3d;
}