body {
    background: #0f1116;
    color: #e5e5e5;
    font-family: Arial, sans-serif;
    margin: 0;
}
.container {
    max-width: 750px;
    margin: 0 auto;
    padding: 40px;
}
header h1 {
    margin: 0;
    font-size: 42px;
}
.subtitle {
    margin-top: 4px;
    opacity: 0.7;
}
h2 {
    margin-top: 40px;
    font-size: 26px;
}
a.button {
    display: inline-block;
    padding: 12px 20px;
    background: #3c6df0;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin-top: 10px;
}
a.button:hover {
    background: #2f54c9;
}
footer {
    margin-top: 60px;
    text-align: center;
    opacity: 0.5;
}