The background image size is 400 pixels wide and 40 pixels tall.
It looks like this (below):

I set a border around it so you can see  it's actual size.  If you don't
use CSS to control the placement of this background image, it will look
like the below image in any browser that is sized greater than 400 pixels
wide. (This demonstration assumes that your browser is sized at greater
than 400 pixels.)  Try to read the type across the page below:

This text looks okay in the white, but don't try to read the text as it goes over the background!!!

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