This is where the main part of the page is defined. You can make any color you want by changing these variables. The amounts are 0 - F or 16 levels. It's a Hexdecimal representation of numbers. There are several tables out on the internet that tell you what do use to make certain colors.
Most web browsers use pictures with the extensions .jpeg, .jpg, or .gif.
So if you are trying to display a scanned in picture, make sure you scan it in as a .jpg or .jpeg. The other, .gif is usually drawings or animations. Right click on the image Choose save as Do not change the three letter extension, but you can name it anything you want. These are the main tags to making a web page. See the top of the page.