Launch actions (close\open launch, other actions) icons are not fully visible in dark mode

[dmitry-rozhd]

Greetings,

here is the issue:

1. Enable dark mode
2. go to /launches
3. observe the existing launches:
   expected: same UI exp comparing with the default color mode.
   actual: the launch actions (close\open launch, other actions) icons are not fully visible in the dark mode, s. the screenshot:
   

The problem is that users with the dark mode cannot notice the mentioned buttons if they do not know where they are.