Apply a background color to your OneNote pages to change their appearance and make your notes more visually appealing.
Change page color
Select View > Page Color, and then choose a color.
Change section color
Right-click a section name in your OneNote notebook, and then select a color.
Turn on rule lines
Select Rule Lines and choose a line option.
Basic tasks in OneNote for Windows 10
Change the background color of a page in OneNote for Windows 10