Alright, first things first, open up your Webflow project where you want to add that smooth scrolling effect for your internal links.

Next, figure out which sections on your page you want to scroll to. You'll need to give each section a unique ID:

1. Click on the section element.
2. Head over to the “Settings” panel (D).
3. In the “Element Settings” panel, find the “ID” field and type in a unique identifier (like section-1, contact, etc.).

Now, let's create the internal link (also known as an anchor link) that will trigger the scroll:

1. Highlight the text or select the button you want to turn into an internal link.
2. Go to the “Settings” panel (D).
3. Under “Link Settings,” choose “Section” and pick the ID of the section you want to scroll to from the dropdown. This sets up your internal anchor link.

Time to enable smooth scrolling:

1. Go to the “Project Settings” from the top-left dropdown menu.

2. Click on the “Custom Code” tab.

3. In the “Head Code” section, insert this CSS code:

   ```css

   ```

4. Save your changes by clicking the “Save Changes” button at the bottom.

Finally, publish your Webflow site to see the smooth scrolling effect in action:

1. Click the “Publish” button located in the upper-right corner of the Webflow Designer.
2. Select the applicable domains and click “Publish to selected domains.”

This makes sure the smooth scrolling works on your live website.