css - Absolute Position Element Within Centered Div -

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i have div centered using auto margins. 900px wide. have login button want position above it, can't figure out how left , right stays in constant place relative div. want inside right edge of div.

first set centered div position relative

#centered-div{position: relative; width: 900px; margin: auto;}

then set login button position absolute

#login{position: absolute; left: 0; top: 50px;}

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