.code {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
}

.hd {
    background-color: #f0f0f0;
    padding: 30px;
    text-align: center;
}

.sticky-navbar {
    background-color: #333;
    color: white;
    padding: 10px 0;
    text-align: center;
    /* sticky position here */
    position: sticky;
    top: 0;
    z-index: 100;
}

.sticky-navbar a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
}

.sticky-navbar a:hover {
    background-color: #555;
}

section {
    padding: 40px 20px;
}

article img {
    width: 100%;
    max-width: 600px;
    height: auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #333;
    font-size: 24px;
}

section:nth-child(even) {
    background-color: #f0f0f0;
}

section p,
section article {
    font-size: 18px;
    line-height: 1.5;
    color: #555;
}

article h3 {
    color: #333;
    font-size: 20px;
}

article p {
    margin-top: 10px;
}

li {
   padding: 10px;
}