body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px;
}

.container {
    background: white;
    padding: 20px;
    max-width: 400px;
    margin: auto;
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

input {
    margin-top: 10px;
    padding: 8px;
    width: 80%;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    margin-top: 10px;
    padding: 10px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    color: white;
}

#check {
    background-color: #28a745;
}

#next {
    background-color: #007bff;
}

#result {
    margin-top: 10px;
    font-weight: bold;
}

#solution {
    margin-top: 10px;
    text-align: left;
}