Yes, it's possible to add additional pages with links between them and CSS files for styling. Here's an updated Dockerfile and file structure that includes multiple pages and CSS styling:

```
# Dockerfile
FROM nginx
COPY html/ /usr/share/nginx/html/

# index.html
<html>
<head>
<title>Hello John</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1>Hello John</h1>
<p>Welcome to my website. Check out my <a href="about.html">about page</a> and my <a href="projects.html">projects page</a>!</p>
</body>
</html>

# about.html
<html>
<head>
<title>About John</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1>About John</h1>
<p>John is a software developer from San Francisco. He loves to code and build things.</p>
<p>Check out his <a href="projects.html">projects page</a> to see some of his recent work.</p>
</body>
</html>

# projects.html
<html>
<head>
<title>John's Projects</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1>John's Projects</h1>
<p>Here are some of John's recent projects:</p>
<ul>
  <li><a href="https://github.com/johndoe/project1">Project 1</a></li>
  <li><a href="https://github.com/johndoe/project2">Project 2</a></li>
  <li><a href="https://github.com/johndoe/project3">Project 3</a></li>
</ul>
<p>Feel free to <a href="about.html">contact John</a> if you have any questions about his work.</p>
</body>
</html>

# style.css
body {
  font-family: Arial, sans-serif;
  font-size: 16px;
  color: #333;
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 36px;
  text-align: center;
  margin-top: 50px;
}

p {
  margin-top: 20px;
  margin-bottom: 20px;
}

ul {
  list-style: none;
  margin-top: 20px;
  margin-bottom: 20px;
  padding: 0;
}

li {
  margin-bottom: 10px;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

```
In this example, we have a directory called html that contains the index.html, about.html, projects.html, and style.css files. The index.html file has links to the about.html and projects.html pages. The style.css file is linked to all three HTML pages to provide styling.

To build and run the updated Docker image:
```
# Build the image with the tag hello-john
docker build -t hello-john .

# Run the container and map port 8080 on the host to port 80 on the container
docker run -p 8080:80 -d hello-john

# Access the homepage using http://localhost:8080
```
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