css之transform-origin,这个主要在图片打开的时候控制显示的位置

x-offset
Is a <length> or a <percentage> describing how far from the left edge of the box the origin of the transform is set.

offset-keyword
Is one of the left, right, top, bottom, or center keyword describing the corresponding offset.

y-offset
Is a <length> or a <percentage> describing how far from the top edge of the box the origin of the transform is set.

x-offset-keyword
Is one of the left, right, or center keyword describing how far from the left edge of the box the origin of the transform is set.

y-offset-keyword
Is one of the top, bottom, or center keyword describing how far from the top edge of the box the origin of the transform is set.

z-offset
Is a <length> (and never a <percentage> which would make the statement invalid) describing how far from the user eye the z=0 origin is set.