Broken/Missing images

[barlowm]

Kibana version:
7.8.0
Elasticsearch version:

Server OS version:

Browser version:
Chrome
Browser OS version:
Windows
Original install method (e.g. download page, yum, from source, etc.):

Describe the bug:

Steps to reproduce:

1. From the Kibana Home page, in the "Observability" panel, click the "Add APM" button
2. In Step 2 - Configure the agent section, there is insufficient color contrast

Expected behavior:
There is a broken image icon with alt text = screenshot of primary dashboard. The screenshot below shows it for the APM component.

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[cauemarcondes]

This has been fixed on 7.9 #66432.

I made a test to confirm: