#smsCountdown {
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #f9f9f9;
    padding: 10px;
}

#countdownTimer {
    font-size: 18px;
    font-weight: bold;
    color: #e74c3c;
}

#resendSmsBtn {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}