body {
    background-color: #f8f9fa;
    min-height: 100vh;
}
.otp-container {
    max-width: 450px;
    padding: 30px;
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}