body {
    background-color: #f2f2f2;
    font-family: Arial, sans-serif;
    margin: 20px;
}


nav {
    background-color: #ccc;
    padding: 10px;
    margin-bottom: 20px;
}

nav a {
    text-decoration: none;
    color: black;
    font-weight: bold;
}


h1 {
    color: red;
    text-align: center;
}

h2 {
    color: darkblue;
    border-bottom: 2px solid #999;
}

h3 {
    color: green;
}

h4 {
    color: rgb(7, 117, 15);
}


img {
    width: 300px;
    border: 3px solid black;
    display: block;
    margin-bottom: 15px;
}


p {
    background-color: white;
    padding: 10px;
    border: 1px solid #ccc;
}


ul, ol {
    background-color: #fff;
    padding: 10px;
    border: 1px dashed #999;
}


video {
    margin-top: 20px;
    border: 4px solid black;
    width: 400px;
}