mime type not set correctly for webpage

"I'm trying to get rainloop PHP webmail setup on a mail server using
OpenBSD 6.9 httpd

I have the webserver configured however the browser shows the mime
type is not correct for the css style sheet.
From Firefox console,
"The stylesheet
https://mail.shopnet.com/rainloop/rainloop/v/1.16.0/static/css/app.min.css?standard
was not loaded because its MIME type, "text/html", is not "text/css".

I included system mime file types in httpd.conf file as below.

Any pointers are appreciated.

thanks


# $OpenBSD: httpd.conf,v 1.20 2018/06/13 15:08:24 reyk Exp $

types { include "/usr/share/misc/mime.types" }

server "mail.shopnet.com" {
listen on * port 80
location "/.well-known/acme-challenge/*" {
root "/acme"
request strip 2
}
location * {
block return 302 "https://$HTTP_HOST$REQUEST_URI"
}
}

server "mail.shopnet.com" {
listen on * tls port 443
tls {
certificate "/etc/ssl/mail.shopnet.com.fullchain.pem"
key "/etc/ssl/private/mail.shopnet.com.key"
}
location "/pub/*" {
directory auto index
}
location "/.well-known/acme-challenge/*" {
root "/acme"
request strip 2
}
location "/rainloop/*" {
fastcgi param SCRIPT_FILENAME "/htdocs/rainloop/index.php"
fastcgi socket "/run/php-fpm.sock"
# directory index "index.php"
}

# Value below is 25MB in bytes. 1MB = 1048576 bytes
connection max request body 26214400
location "/data*" {
block return 403
}

location "/rainloop/*.php*" {
fastcgi socket "/run/php-fpm.sock"
}
}