Hot answers tagged css
you can use sprite cow to generate your css http://www.spritecow.com/
try <SharePoint:CSSRegistration ID="CSSReg5" name="<%$SPUrl:~SiteCollection/Style Library/CSS/styles.css%>" After="corev4.css" runat="server"/> the part <%$SPUrl:~SiteCollection points to the root site collection, maybe your code is not pointing to that location! rather the site or sub site, method above explicitly says root site collection ...
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