Aligning .png in CSS header

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Sorry if this is a real noobie question but I just started using CSS…

How can I align the image in my header so that it isn’t multiplied ie lots of different images appear next to each other. I just want one image as my header which is centered.

This is my code

#header {
     background-color: #FFFFFF;
     color: #FFFFFF;
     background-image: url(flash_logo.png);
 }