I created an Asp.net 5 web application via "yo aspnet". I downloaded a new bootstrap.min.css and added it in css folder. I then changed _Layout.cshtml and gulpfile.js to reference bootstrap.min.css instead of the default site.min.css (screenshot below).
The problem is when I run the site via dnx web the site still uses site.min.css even though no part of my code references site.min.css anymore. I'm not sure what is happening now?
If I manually change the site.min.css via devtools I can see the correct theme appply.
Clear your browser cache and try to find site.css
string on your whole solution.