body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
}

header {
    background-color: #343a40;
    color: #fff;
    text-align: center;
    padding: 20px;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #ccc;
}

main {
    padding: 20px;
}

aside {
    background-color: #fff;
    padding: 20px;
    border-left: 1px solid #ccc;
}

footer {
    background-color: #343a40;
    color: #fff;
    text-align: center;
    padding: 10px;
}

.cipher-box {
    background-color: #f8f9fa; /* Default background color */
    padding: 20px;
    border-radius: 10px; /* Rounded corners */
    margin-bottom: 20px; /* Add space between boxes */
}

.cipher-box:nth-child(even) {
    background-color: #e9ecef; /* Alternate background color */
}