Sure, let's create a simple HTML/CSS project that displays "Hello World" on the webpage.
We will need two files for this: an HTML file and a CSS file.
The HTML file will contain the structure of our webpage, and the CSS file will contain the styles for our webpage.
Here are the contents of each file:
index.html
```
Hello World
Hello World
```
styles.css
```
#greeting {
color: blue;
text-align: center;
margin-top: 50px;
}
```
In the HTML file, we have a `link` tag in the `head` section that links to our CSS file. This is how the HTML file knows which CSS file to use for styling.
In the body of the HTML file, we have an `h1` tag with the id "greeting". This id is used in the CSS file to apply styles to this specific element.
In the CSS file, we have a rule for the id "greeting". This rule applies three styles to the element with this id: it changes the text color to blue, centers the text, and adds a top margin of 50px.
To view this webpage, you can simply open the HTML file in a web browser.
This concludes a fully working implementation.