body {
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
}

.container {
    width: 100%;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h2 {
    text-align: center;
    color: #333333;
    margin-top: 0;
    margin-bottom: 30px;
}

.key-section {
    margin-bottom: 30px;
}

.key-output {
    display: flex;
    justify-content: space-between;
}

.key-column {
    flex-grow: 1;
    margin-right: 10px;
}

.key-column:last-child {
    margin-right: 0;
}

.encryption-decryption {
    display: flex;
    justify-content: space-between;
}

.encryption-column {
    flex-basis: 50%;
    padding: 20px;
    border-radius: 10px;
    background-color: #ffe0b2;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.decryption-column {
    flex-basis: 50%;
    padding: 20px;
    border-radius: 10px;
    background-color: #bbdefb;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h4 {
    margin-top: 0;
    color: #333333;
}

label {
    display: block;
    margin-bottom: 10px;
    color: #333333;
}

textarea {
    width: 100%;
    height: 15px;
    resize: none;
    padding: 10px;
    border: 1px solid #dddddd;
    border-radius: 5px;
}

button {
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #45a049;
}

@media only screen and (max-width: 600px) {
    .key-output {
        display: flex;
        flex-direction: column;
    }

    .key-output .column {
        margin-bottom: 10px;
    }

    .encryption-decryption {
        display: flex;
        flex-direction: column;
    }

    .encryption-decryption .column {
        margin-bottom: 20px;
    }
}