Nginx and owncloud in a subfolder

I want to have an owncloud instance in a subfolder on my nginx server. But I have problems with some files requested by opwncloud (it seems css and js are not loading).

Here is the nginx config for this virtual host:

server {
   listen         80;
   server_name    blackblock.22decembre.eu;
   return 301     https://blackblock.22decembre.eu$request_uri;
}

server {
listen 443 default_server ssl;

server_name blackblock.22decembre.eu;
root /srv/www/blackblock/;

access_log  /var/log/nginx/blackblock.access.log;
error_log   /var/log/nginx/blackblock.errors.log;

index index.html index.php;

# This block will catch static file requests, such as images, css, js
# The : prefix is a "non-capturing" mark, meaning we do not require
# the pattern to be captured into $1 which should help improve performance
location ~* \.(:ico|css|js|gif|jpeg|png)$ {
    # Some basic cache-control for static files to be sent to the browser
    expires max;
    add_header Pragma public;
    add_header Cache-Control "public, must-revalidate, proxy-revalidate";
}

# remove the robots line if you want to use wordpress" virtual robots.txt
# location = /robots.txt { access_log off; log_not_found off; }
location = /favicon.ico { access_log off; log_not_found off; }

# this prevents hidden files (beginning with a period) from being served
location ~ /\. { access_log off; log_not_found off; deny all; }

#location ~ ^(?<script_name>.+?\.php)(?<path_info>/.*)?$ {
location ~ \.php {
    fastcgi_param SCRIPT_NAME $fastcgi_script_name;
    #fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $path_info;
    fastcgi_index index.php;
    fastcgi_pass unix:/run/php5-fpm.sock;
    include fastcgi_params;
}

location /roundcube/program/js/tiny_mce/ { alias /usr/share/tinymce/www/; }
location /roundcube/(config|temp|logs) { deny all;}

 ##### owncloud
 location ~ /owncloud/ {
root /srv/www/blackblock/owncloud/;
try_files $uri $uri/ index.php;

#client_max_body_size 10G; # set max upload size
    #fastcgi_buffers 64 4K;

    rewrite ^/caldav(.*)$ /remote.php/caldav$1 redirect;
    rewrite ^/carddav(.*)$ /remote.php/carddav$1 redirect;
    rewrite ^/webdav(.*)$ /remote.php/webdav$1 redirect;

    location ~ ^/remote.php(/.*)$ {
            fastcgi_split_path_info ^(.+\.php)(/.*)$;
            fastcgi_pass unix:/run/php5-fpm.sock;
    include fastcgi_params;
    }

    error_page 403 /core/templates/403.php;
    error_page 404 /core/templates/404.php;

    location ~ ^/(data|config|\.ht|db_structure\.xml|README) {
            deny all;
    }

# The following 2 rules are only needed with webfinger
rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json last;
rewrite ^/.well-known/carddav /remote.php/carddav/ redirect;
rewrite ^/.well-known/caldav /remote.php/caldav/ redirect;
rewrite ^(/core/doc/[^\/]+/)$ $1/index.html;

    # Optional: set long EXPIRES header on static assets
    #location ~* ^.+\.(jpg|jpeg|gif|bmp|ico|png|css|js|swf)$ {
     #       expires 30d;
            # Optional: Don't log access to assets
      #      access_log off;
#   }
}

    ##### torrent (not related to owncloud, flask application)
location = /flask-torrent { rewrite ^ /flask-torrent/ last; }

 }

I can not find why owncloud is not loading correctly! You can take a look at the site, I feel good and am provided for this: https://blackblock.22decembre.eu/owncloud/ (cacert certificate). If I run a specific virtual host for owncloud, it works fine, but I do not want it, I prefer it in a subfolder of this host (blackblock)!