Forum How can I fix this?

[محروم.كوم]

Left border is not the same as with the right.
But I both sized them(left and right) as 120px in doc_margin.
When I change the sizing that will make it in the center in my computer,
other members complained that the margin went wrong.
So how can I make both margin in the same size? __DEFINE_LIKE_SHARE__