I created a new asp.net mvc-5 web application using VS 2013. now that I try to embed the login form and I leave the required fields blank, I got the following: -

where both fields were not highlighted in red, as I use to get into previous versions of asp.net mvc. now from the generated markup I can verify that any field with validation errors will have the following class: -
input-validation-error
css, - asp.net mvc-5; site.css, bootstrap.css bootstrap.min.css, -?? - , , , , asp.net mvc-5?