body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    text-align: center;
}

.password-input {
    width: 40px;
    height: 40px;
    margin: 5px;
    font-size: 18px;
    text-align: center;
}