body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
    color: #333;
}
header {
    text-align: center;
    margin-bottom: 20px;
}
header h1 {
    margin: 0;
    font-size: 2em;
}
header a {
    display: inline-block;
    margin-top: 10px;
    color: #228B22;
    text-decoration: none;
    font-weight: bold;
}
header a:hover {
    text-decoration: underline;
}
main {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
section {
    margin-bottom: 20px;
}
h2 {
    color: #228B22;
    font-size: 1.5em;
}
p, li {
    line-height: 1.6;
}
ol, ul {
    margin: 10px 0;
    padding-left: 20px;
}
footer {
    text-align: center;
    margin-top: 20px;
}
#topButton {
    padding: 10px 20px;
    font-size: 1em;
    background-color: #228B22;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
#topButton:hover {
    background-color: #1a6b1a;
}