spring mvc error of mime type

hi how I currently have a project with the following technologies

good at the time of generating a view with external css to which I mean to make href out of the server .. there is no problem

but at the moment of inserting a css (if it loads it) but send this message in the google console:

  

Refused to apply style from ' link ' because its MIME type ('text / html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.