CSS -如何删除锚定图像之间的空白

I have two anchored images on top of each other, separated with a line break. I want the images to sit directly on top of each other, but in Firefox there is a gap between the images. It works in IE7. The only way I have been able to fix this is by changing the line-height (which I don't want to do).I have two anchored images on top of each other