"Loading" svg is not transparent

[enoch85]

Steps to reproduce

1. Create a federated share

Expected behaviour

The "loading" svg to be transparent

Actual behaviour

Server configuration

Operating system:
Ubuntu 16.04 Server
Web server:
Apache 2.4
Database:
MySQL 5.7
PHP version:
7.0.8
Version: (see admin page)
11.0.0 beta2
Updated from an older version or fresh install:
Fresh install
List of activated apps:

``` Enabled: - activity: 2.3.2 - calendar: 1.4.1 - comments: 1.0.0 - contacts: 1.4.0.0 - dav: 1.0.1 - documents: 0.13.1 - federatedfilesharing: 1.0.1 - federation: 1.0.1 - files: 1.5.2 - files_external: 1.0.2 - files_pdfviewer: 0.8.1 - files_sharing: 1.0.0 - files_texteditor: 2.1 - files_trashbin: 1.0.0 - files_versions: 1.3.0 - files_videoplayer: 0.9.8 - firstrunwizard: 1.1 - gallery: 15.0.0 - mail: 0.6.0 - notifications: 0.3.0 - password_policy: 1.0.0 - provisioning_api: 1.0.0 - serverinfo: 1.1.1 - spreedme: 0.3.4 - survey_client: 0.1.5 - systemtags: 1.0.2 - tasks: 0.9.3 - theming: 1.0.1 - updatenotification: 1.0.1 - user_external: 0.4 - workflowengine: 1.0.1 Disabled: - admin_audit - encryption - external - files_accesscontrol - files_automatedtagging - files_retention - templateeditor - user_ldap - user_saml ```

The content of config/config.php:

``` { "system": { "instanceid": "oczset2i2y1m", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "secret": "***REMOVED SENSITIVE VALUE***", "trusted_domains": [ "demo.orestad-linux.se" ], "datadirectory": "\/var\/ncdata_demo\/", "overwrite.cli.url": "https:\/\/demo.orestad-linux.se", "dbtype": "mysql", "version": "9.1.1.5", "dbname": "nextcloud_demo", "dbhost": "localhost", "dbport": "", "dbtableprefix": "oc_", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "logtimezone": "Europe\/Stockholm", "installed": true, "preview_libreoffice_path": "\/usr\/bin\/libreoffice", "memcache.local": "\\OC\\Memcache\\Redis", "filelocking.enabled": true, "memcache.distributed": "\\OC\\Memcache\\Redis", "memcache.locking": "\\OC\\Memcache\\Redis", "redis": { "host": "\/var\/run\/redis\/redis.sock", "port": 0, "timeout": 0, "dbindex": 0 }, "mail_smtpmode": "smtp", "mail_smtpauth": 1, "mail_smtpport": "587", "mail_smtphost": "mail.citynetwork.se", "mail_smtpauthtype": "LOGIN", "mail_from_address": "orestadlinux", "mail_domain": "techandme.se", "mail_smtpname": "***REMOVED SENSITIVE VALUE***", "mail_smtppassword": "***REMOVED SENSITIVE VALUE***", "mail_smtpsecure": "tls", "maintenance": false, "appstore.experimental.enabled": true } } ```

Client configuration

Browser:
Chrome (Debbian)
Operating system:
Deepin 15.3

cc @nextcloud/designers

[MorrisJobke]

Fix is in #2469