Need help with design (UI) ajustments

[Kali_Etrog]

Hi all.
I’m a product designer and new to Looker, Currently working on adjusting the Looker implemented dashboard to our app’s look & feel.
Was wondering if you could help me adjust the following, so that the dashboard would better feet our app’s dark theme:

1. The swatch of white strokes appearing in infographics and separators
2. A tile title size

Thank you!