.register-container {
    max-width: 400px;
    margin: 80px auto;
    padding: 2rem;
    background: #ffffff;
    border-radius: 0.5rem;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
@media (max-width: 576px) {
    .register-container {
        margin: 40px auto;
        padding: 1.5rem;
        max-width: 95%;
    }
}