body {
    font-family: Arial;
    background: #0f172a;
    color: #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}
.card {
    text-align: center;
    max-width: 400px;
}
h1 {
    font-size: 36px;
    margin-bottom: 10px;
}
p {
    color: #9ca3af;
    margin-bottom: 20px;
}
a {
    color: #60a5fa;
    text-decoration: none;
    display: block;
    margin-top: 10px;
}
a.main {
    margin-top: 20px;
    font-weight: bold;
}

@media (max-width: 600px) {
    h1 {
        font-size: 24px;
    }
}