Onboard styling doesn't match new theme

[iamacook]

Bug description

Some elements of the onboard modal don't match that of the new theme. The CSS variables of onboard need to be better mapped to our new theme

Steps to reproduce

1. Connect varying wallets and observe the colours do not match perfectly to our new theme.

Expected result

• The stepper is primary.main in light mode.
• THe checkmark is a darker color in light mode.

Obtained result

• The stepper is green in light mode.
• The checkmark of a connected wallet is white (and hard to see) in light mode.

Screenshots

[francovenica]

Adding to this ticket. The onboard for the connection with physical devices needs revision The light theme show the neon-green in buttons and other places In the dark mode the "Confirm" button is purple

[francovenica]

LGMT