Steps to reproduce:

1. Log in to back office.
2. Go to Commerce / Order management.
3. Click on left and right date picker.
4. Verify if both date pickers are properly illuminated.

Actual result:

See attached screenshot and watch gifs:
https://recordit.co/xKixqunxpf
https://recordit.co/1J07Q8ITdG

Left date picker is not fully illuminated.

Expected result:

Properly illuminated date selectors.