css - why margin-right is not showing when div is wider than window -


i want know why margin on right side not showing when div wider window.

#red {     width:4000px;     height:3000px;     background:red;     margin:20px;  }

i can see in browser window, top,bottom , left margin-ed correctly no margin @ right,but working fine when div narrower window's width.why so?

thanks in advance


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