Help with Css layout

well im trying to make a layout for my tumblr i found one i liked and im trying to make simple things like putting a header and a background picture ive used the default codes but i doesn't work here is the css

<!DOCTYPE HTML>
<html lang="en-US">
<head>
<!-- ==============================================================================================================
  Name:     Circus v1
  Credits:      Inspiration <a href="http://ainiesta.com/
" rel="nofollow">http://ainiesta.com/
</a>                Lobster font on Google Font Directory - <a href="http://code.google.com/webfonts/family?family=Lobster" rel="nofollow">http://code.google.com/webfonts/family?family=Lobster</a>

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