What do you mean by no-repeat familiar with the figures in the CSS?

The role of 80px and 0 is to tell you where the picture is. By default, if you do not set the following number, the picture is placed on the top left of the page, where the following figure

An offset in the upper-left corner (0,0)

The first number is the offset on the x-axis, which is the horizontal offset, representing the right, minus the left!

The second number is the offset on the y-axis, that is, the horizontal offset, which indicates downward, and the negative indicates upward!

If you change the code to

Then the picture moves down 80 pixels to the right, and the effect is as follows:

If your settings parameter is exceeded, it will not be displayed. If I change the value 80 on the y-axis of the code to 80, then the page will not appear.

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