openproject/app/views/highlighting/styles.css.erb

<%# Highlightable resources %>
<%= resource_color_css('status', ::Status) %>
<%= resource_color_css('priority', ::IssuePriority) %>
<%= resource_color_css('type', ::Type) %>
<%= color_css() %>

<%# Overdue tasks %>
.__hl_date_due_today { color: #F76707 !important; }
.__hl_date_overdue { color: #C92A2A !important; font-weight: bold; }