We are going to use a simple methos to change the css of your site live. So for example you can let your users choos the template or color that they like the most.
I used twitter bootstrap and the bootswatch (amazing) for this example.
In the header of your HTML:
Here we load the CSS in case there’s a cookie we use the previous used one.
We add some buttons to let the user choose:
And finally some javascript at the bottom, remember to load jQuery if not doesn’t work.
And that’s all 😉