Answer:
I can provide you with the code for a simple HTML program that displays "Happy Birthday" in a different color. Here is the code:
```html
<!DOCTYPE html>
<html>
<head>
<title>Happy Birthday!</title>
<style>
#birthday {
color: blue;
}
</style>
</head>
<body>
<h1 id="birthday">Happy Birthday!</h1>
</body>
</html>
```
This program creates a simple HTML document with a heading element that displays "Happy Birthday!" in blue. You can open this code in a text editor and save it with a .html extension. Then, you can open the file in a web browser to see the result. You can also modify the color by changing the "color" property in the CSS style.