contrast background adjust to text colors not worked

[vvbasti]

Hy, i have little problem with your fix, for the contrast usability issue from the tags background colors whet its too light for the text colors (white).
My code is complete the same with in your Repo, and the colors for all tags is shows everything white.

Can you help me for fix this.
Thank you and best regards.

I have test with the classic theme without any modifications

Environment:
Redmine version 3.4.6.stable.17615
Ruby version 2.3.3-p222 (2016-11-21) [x86_64-linux]
Rails version 4.2.10
Environment production
Database adapter Mysql2
SCM:
Subversion 1.8.10
Mercurial 3.1.2
Bazaar 2.7.0
Git 2.1.4
Filesystem
Redmine plugins:
additionals 2.0.20
clipboard_image_paste 1.13
computed_custom_field 1.0.7
customfield_checkbox_utility 0.0.2
hide_journal_details 0.0.2
pdf_export_redmine 0.0.2
plantuml 0.5.1
project_tree 1.0.3
recurring_tasks 2.0.0-pre
redmine_banner 0.1.2
redmine_ckeditor 1.1.7
redmine_custom_css 0.1.7
redmine_default_custom_query 1.3.0
redmine_didyoumean 1.2.4
redmine_glossary 0.9.3
redmine_impersonate 1.0.0
redmine_issue_templates 0.2.1
redmine_issue_todo_lists 1.2
redmine_issues_macros 0.0.1
redmine_ldap_sync 2.1.0
redmine_my_page_paginations 1.0.2
redmine_page_break_macro 1.0.0
redmine_preview_inline 1.0.2
redmine_risks 1.1.2
redmine_scheduling_poll 4.1.0
redmine_shortcuts 0.3.0
redmine_subtask_list_accordion 1.3.2
redmine_subtasks_inherited_fields 1.1.1
redmine_tags 3.2.2
redmine_tint_issues 1.0.2
redmine_wiki_books 0.0.5
redmine_wiki_issue_fields 0.5.9
view_customize 2.5.0