There are different methods to set correctly your css. You need to search in 'app/views/layouts' for the correct layout and find some of the next lines :
<%= stylesheet_link_tag "scaffold.css", :media=>'print,screen' %>
<%= stylesheet_link_tag "#{module_name}/scaffold.css" %>
<%= stylesheet_for_current_controller %>
Why you're using the path 'myblog'? I think that's why you are getting the wrong path to the css file.
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