body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f4f4f4;
}
.container {
    text-align: center;
    padding: 20px;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}
button {
    margin: 10px;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    background-color: #007bff;
    color: white;
    cursor: pointer;

}
button:hover {
    background-color: #0056b3;
}
.hidden {
    display: none;
}
.result {
    margin-top: 20px;
    font-weight: bold;
}
.green {
    color: green;
}
.red {
    color: red;
}