body {
    background: linear-gradient(133deg, Blue, DarkViolet, Purple);
    min-height: 100vh;
}

.card {
    border: none;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-radius: 5% !important;
}

.keypad button {
    font-size: 24px;
    height: 100px;
    width: 100px !important;
    border-radius: 50% !important;
    margin: auto;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
}

.keypad button:active {
    transform: scale(0.95);
    background-color: #dee2e6;
}

.keypad button.pressed {
    background-color: #dee2e6;
}

.pin-dots {
    font-size: 24px;
    letter-spacing: 5px;
    color: #333;
}

#pin-display {
    min-height: 30px;
}

#message {
    background-color: rgba(255, 255, 255, 0.8);
}

@media (max-width: 576px) {
    .keypad button {
        font-size: 20px;
        height: 60px;
        width: 60px !important;
    }
}

@media (max-width: 400px) {
    .keypad button {
        font-size: 18px;
        height: 50px;
        width: 50px !important;
    }
}