color doesn't work

This question already has an answer here:

  • How do you keep parents of floated elements from collapsing? [duplicate] 16 answers

  • Having all your children , in this case all the -li- elements floated, will collapse the height of the parent, reason why you can't see your background.

    You could fix this by either setting a specific height for your -ul or maybe using something like clearfix.

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