body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    display: flex;
    justify-content: center;
    padding-top: 50px;
}

.container {
    width: 400px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
}

input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}

button {
    width: 100%;
    padding: 10px;
    background: black;
    color: white;
    border: none;
    cursor: pointer;
}

.hidden {
    display: none;
}