body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    width: 50%;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    margin-top: 50px;
}

h1 {
    color: #333;
}

p {
    font-size: 18px;
    color: #555;
}

button {
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 10px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #0056b3;
}

input {
    width: 80%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}

form {
    margin-top: 20px;
}

.result {
    font-size: 18px;
    color: #007BFF;
    margin-top: 20px;
}

.error {
    color: red;
    font-weight: bold;
}