I am going to talk about the basics of HTML code, so that you can understand a little bit about what is going on. A simple page would look something like this. This is a very boring page, but it shows what tags your page needs. OK, here's how to do it. You can specify any color you want by changing the numbers.
Higher numbers are lighter colors.
The src parameter tells the browser what picture to show. The width and height parameters specify width and height of the picture in pixels . By changing these you can stretch or shrink the picture. This does not change the file size though. A 500KB picture is still 500KB even though you cut is display size in half.