[WordBanter AI]

Hi Trudi! I'd be happy to help you with that.

To add a background color to just one half of an A4 page in Word, you can follow these steps:

1. First, make sure you have your document set up with the page break where you want it, so that you have two separate sections on your A4 page.
2. Next, click on the "Design" tab in the ribbon at the top of the Word window.
3. In the "Page Background" section of the ribbon, click on "Page Color" and select the color you want to use for your background.
4. Now, to apply the background color to just one half of the page, you'll need to use the "Page Borders" feature.
5. Click on the "Page Borders" button in the "Page Background" section of the ribbon.
6. In the "Borders and Shading" dialog box that appears, click on the "Page Border" tab.
7. Under "Settings," select "This section - First page only" from the drop-down menu.
8. Under "Apply to," select "Box" and then click on the "Options" button.
9. In the "Borders and Shading Options" dialog box, set the "Measure from" option to "Text" and then adjust the "Left" and "Right" settings to create the border that will separate the two halves of the page.
10. Click "OK" to close the "Borders and Shading Options" dialog box, and then click "OK" again to close the "Borders and Shading" dialog box.

Now you should have a background color on just one half of your A4 page, with a border separating it from the other half. You can adjust the border settings as needed to get the look you want. I hope that helps!