html - CSS: How to center element that is bigger then the container? -


I have an element of 800px and the container is small (it is responsive so that the width is changing), I have such a code : 

  & lt; Div id = "container" & gt; & Lt; Div id = "popup" & gt; & Lt; / Div & gt; & Lt; / Div & gt;   
 and CSS:  
  # container {width: 400px; Status: Relative; } #popup {width: 800px; Status: Completed; }   
 I tried  left: 0, right: 0, margin: auto;  But it is not working Box is aligned to the left. / P> 
 here   
 
 
 You can use  margin-left: - ( Half width) PX  and  left: 50%   
 Then your code popup css code will look like this:  
  #popup {position : Absolute; Width: 300px; Background-color: # 0a; Height: 20px; Top: 100px; Left: 50%; Margin-left: -150px; Z-index: 100; }

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