Responsive margin

If a website is centered in the browser window using a div with id "container" with margin :0 auto; How can I add 20px margin when the browser window width is less than the website width? I've tried the following:
#container {margin:0 auto;}
@media (min-width:1000px) { #container {margin:0 0 0 20px;} }

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But this seems to always include the margin, it only seems to apply whatever is in the @media (min-width:1000px) css.
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ncwAsked:
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ncwAuthor Commented:
This seems to do it for a 1000px wide site:
@media (max-width:1040px) { #containerHome {margin:0 0 0 20px;} }
@media (min-width:1040px) { #containerHome {margin:0 auto;} }

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Unless there's a better way without adding an outer div.
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GaryCommented:
No, that's the correct way to do it.
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