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The code is not getting accepted inspite of that producing the desired results in the preview
width : 80%; margin : 0 auto; }
Steven Parker228,991 Points
I think you have found an actual bug here. You might want to report this to firstname.lastname@example.org - it will likely get you an exterminator badge!
In the meantime, to continue your course progress, remove the spaces between the property names and the colons. As you noticed, it does not affect the rendering of the style, but for the moment it apparently interferes with the challenge scoring mechanism.
width: 80%; margin: 0 auto; }