How to make bootstrap override Yii's built-in style library?

Question

css

And I'm also interested in such a moment - when the line is entered in main layouts/main.php:
[PHP]<?php echo $content; ?>[/PHP]
Then the class span19 is defined to the outer created div, how to make the class not assigned without the help of js.

Answer 1

it’s better to remove demo styles and layout altogether,
they are made for reference only

Answer 2

Include bootstrap css later than yish.
On the second question - just put this class from JS.