Check out example codes for "move css background image". It will help you in understanding the concepts better.

Code Example 1

background-position: 10px 20px; /*#10px from left 20px from top*/

Code Example 2

background-image: url('w3css.gif');
 background-repeat: no-repeat;
 background-attachment: fixed;
 background-position: center;

Code Example 3

.right-align-background {
    background-position: center right;
}

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