css file defined in .info file is not loading in Drupal 7 This is the my .info file details

name = Tripsinn
description = A flexible, recolorable theme with many regions.
package = Core
version = VERSION
core = 7.x
stylesheets[all][] = css/responsiveslides.css
stylesheets[all][] = css/style.css
scripts[] = js/responsiveslides.min.js


but these css are not loading

URL: http://dev.easysites.in/tripsinn/

this is a custom drupal theme under development.
As far as I can see in the URL you posted, both css/style.css and js/responsiveslides.min.js are being loaded fine, but there is no trace of the css/responsiveslides.css file. Maybe you are not placing that file in the appropriate directory?

Hope that helps,