title: How can i apply css when a query string is used?
body: <p>What i want to do is (at the end of the body) check for a query string and apply css depending on what it is.</p>
  
  <p>www.example.com
  Will do nothing</p>
  
  <p>www.example.com/example--location/example.html?theme=Red
  will add the 'red' css</p>
  
  <p>www.example.com/example-path/example2.html?theme=yellow
  will ass the 'yellow' css</p>
  
  <p>Also, if possible, i need the theme to follow them to other urls on my site when they click a link/tab.</p>