.login-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 20px;
    width: 500px;
    max-width: 90%;
    margin: 0 auto;
}
.btn-signin {
    background: #2ECC71;
    color: white;
    padding: 12px;
    border-radius: 8px;
    border: none;
    transition: background 0.3s;
}
.btn-signin:hover {
    background: #27AE60;
}