Thank you for sending the link to the tutorial.
The code you had me enter only changes the menu boxes on the blogs – it doesn’t change the background of the page.
When I do the shift ctrl I, and change the background color to #ffffff, it appears correctly, but the when I add the code to the css box, it doesn’t change. I have tried many compbinations, also tried using <style>. The webpage says not to use <style> — your code uses it. Not sure which direction to go? I have attached a screenshot of the screen when I change the color on the screen – i circled my change in red.