title: Customization of Css for huge number of users
body: <p>I have a website where user can select themes, customize background,text and many more.
  I want to save all the changes.</p>
  
  <p>Which one would be a better read?? a database read or a file read. </p>
  
  <p>any suggestions?</p>
  
  <p>Thanks in advance !!!</p>