Nginx gives the css file, but the properties from it do not work. Why?

Question

css

Friends, I'm in a stupor.
Nginx is configured to serve static files with this directive

server {
    listen 80;

    location / {
      root /root/zenresult/app;
    }

    location /static {
      alias /root/zenresult/static;
    }
}

At the same time, css files are really distributed, but the properties written in them have no effect. Neither mine nor bootstrap's.
Here is an explanatory picture:

At the same time, if you connect to the bootstrap via cdn

<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">

then the bootstrap properties take effect.
Help me figure out what I'm doing wrong.

Answer 1

All CSS with mime is given to text/plain.
Add something like this to the http section
include /etc/nginx/mime.types

Answer 2

Check that the files are served with the correct mime type.

Answer 3

CSS exactly in that folder? Check it out though.