body {
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: white;
    margin: 0;
    padding: 0;
    text-align: center;
}
header {
    background: #1e293b;
    padding: 2rem;
}
main {
    padding: 2rem;
}
form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}
input, button {
    padding: 0.75rem;
    width: 80%;
    max-width: 400px;
    border: none;
    border-radius: 5px;
}
button {
    background-color: #3b82f6;
    color: white;
    font-weight: bold;
    cursor: pointer;
}