body {
    font-family: sans-serif;
    text-align: center;
    margin-top: 50px;
}
input[type=password] {
    font-size: 24px;
    width: 200px;
    text-align: center;
}
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 70px);
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}
.btn {
    padding: 20px;
    font-size: 18px;
    border-radius: 8px;
    border: 1px solid #444;
    background: #eee;
    cursor: pointer;
    touch-action: manipulation;
}
@media (max-width: 600px) {
    .btn {
        padding: 30px;
        font-size: 24px;
    }
}