body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
}

h2 {
    color: #333;
}

input[type="file"] {
    margin-bottom: 10px;
}

input[type="number"] {
    margin-bottom: 10px;
    padding: 5px;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
}

.encrypt,
.decrypt {
    margin-bottom: 20px;
}

.encrypt {
    border-bottom: 1px solid #ccc;
    padding-bottom: 20px;
}