The provided HTML code is a part of a web page that uses a combination of inline styles, CSS classes, and JavaScript to render a figure element with an image. Here's a simplified version of the code:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
/* CSS styles here */
figure {
background-image: linear-gradient(to bottom, #f0f0f0, #ccc);
background-size: 100% 300px;
height: 300px;
margin-top: 10px;
padding: 20px;
}
</style>
</head>
<body>
<figure class="gv-fig">
<img src="image_url" alt="Image description">
<!-- image content -->
</figure>
<div id="gv-fixed-btn-container">
<button id="toggle-view-overlay-btn">Toggle view overlay</button>
</div>
<footer id="gv-footer">
<p class="gv-credit">Copyright © 2023</p>
</footer>
</body>
</html>
```
And the corresponding CSS:
```css
.gv-fig {
background-image: linear-gradient(to bottom, #f0f0f0, #ccc);
background-size: 100% 300px;
height: 300px;
margin-top: 10px;
padding: 20px;
}
#toggle-view-overlay-btn {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background-color: #fff;
border-radius: 5px;
padding: 10px;
cursor: pointer;
}
```
Note that I removed the JavaScript code as it was not provided in your original message. The HTML and CSS above should provide a basic structure for a figure element with an image and a toggle button overlay.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
/* CSS styles here */
figure {
background-image: linear-gradient(to bottom, #f0f0f0, #ccc);
background-size: 100% 300px;
height: 300px;
margin-top: 10px;
padding: 20px;
}
</style>
</head>
<body>
<figure class="gv-fig">
<img src="image_url" alt="Image description">
<!-- image content -->
</figure>
<div id="gv-fixed-btn-container">
<button id="toggle-view-overlay-btn">Toggle view overlay</button>
</div>
<footer id="gv-footer">
<p class="gv-credit">Copyright © 2023</p>
</footer>
</body>
</html>
```
And the corresponding CSS:
```css
.gv-fig {
background-image: linear-gradient(to bottom, #f0f0f0, #ccc);
background-size: 100% 300px;
height: 300px;
margin-top: 10px;
padding: 20px;
}
#toggle-view-overlay-btn {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background-color: #fff;
border-radius: 5px;
padding: 10px;
cursor: pointer;
}
```
Note that I removed the JavaScript code as it was not provided in your original message. The HTML and CSS above should provide a basic structure for a figure element with an image and a toggle button overlay.