Font color for spy panel in dashboard in dark theme is not visible.

[bhavyarm]

Kibana version: 6.0.0 - beta1 BC6

Elasticsearch version: 6.0.0 - beta1 BC6

Server OS version: darwin_x86_64

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Description of the problem including expected versus actual behavior: If you open spy panel on vizs when dashboard is in dark mode - the font for contents of table and statistics is not really visible. It's light grey on white background. For the tabs request and response, the contents get displayed over a dark background. So that's visible. But the text above the contents: "elasticsearch request" and "elasticsearch response" is not really visible again.

table:

request:

response:

statistics: