To insert a background (either a colour or an image) in the webpage you are currently working on,
If you have an image you would like to insert, you would click on the "background image" box and select the file by clicking on the "Browse" menu. Otherwise, simply change the colour of the background by clicking on the "Background" drop-down menu and choose "Navy" (or another colour of your choice). Be sure that the colour is never "Default" - instead, choose "White" when you want white. When Macintosh users view a webpage with a default colour, a gray background will appear as opposed to white. Click OK to set the new background colour.