body {
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.form-container {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h1 {
    color: #333333;
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 14px;
    color: #333333;
    margin-bottom: 5px;
}

input[type="text"] {
    width: calc(100% - 20px);
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #dddddd;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 14px;
    color: #333333;
}

input[type="text"]:focus {
    border-color: #007bff;
    outline: none;
}

input[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    color: #ffffff;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

input[type="submit"]:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 15px;
}

#result p {
    font-size: 16px;
    color: #333333;
}

#result p#error {
    color: red;
    font-weight: bold;
}

.back-link {
    display: inline-block;
    margin-top: 15px;
    text-decoration: none;
    color: #007bff;
    font-size: 14px;
    font-weight: bold;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: #0056b3;
}