<body bgcolor="?"> sets the background color
Why make your Web page on a boring white background when there's a world of color out there? You can choose a page's background color inside the <body> tag at the beginning of your document. So, if you write this in your HTML document:
<body bgcolor=yellow>
... your background will be yellow.
Not every color name will work, but a lot will. For a more complete list, take a look at our Color Codes section.