How to make it .body { margin: 0; } - how to write it in ruby?

Question

ruby

require 'sinatra'

get '/' do
 slim <<EOF
    doctype html
    html
      head 
        body
        title
       
       iframe width="100%"scrolling="no" height="750" src="" frameborder="0" #{details.hostname}
        
EOF
 
end

Answer 1

Sinatra loads all static files from public by default
Put js and css there