body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #1b1b1b;
    color: white;
    padding: 1em;
    text-align: center;
}
nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
}
main {
    padding: 20px;
}
.hero {
    background-color: #f0f0f0;
    padding: 40px;
    text-align: center;
}
.hero .btn {
    background-color: #007BFF;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
}
footer {
    background-color: #1b1b1b;
    color: white;
    padding: 1em;
    text-align: center;
    font-size: 0.9em;
}