My css file : enter image description here And this file when build : ( not change ) enter image description here Sometime I try "clean-solution" and "build-solution" then it’s working, but now isn’t working. Thank. >Solution : May be the CSS file is cached. You can try open the Chrome Dev Tools -> Network… Read More CSS File in wwwroot is not refreshing when i change the code ( ASP.NET MVC 6.0)