PRUEBOTA MARGINS

HTML
<html> <head></head> <body> <div id="outter"> <div id="inner"></div> </div> </body> </html>
CSS
#outter { background-color: lightgray; width: 1000px; height: 200px; } #inner { width: 200px; height: 200px; background-color: red; }
JAVASCRIPT
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