Backlog and Typetalk has Light/Dark mode themes for appearance which you can choose for your eye comfort.
Also, you can set them to follow your OS (Operating System) preference or sync them with your Nulab Account preference.
How to synchronize Light/Dark appearance settings
Step 1: In Backlog, go to your User Information page. Set the “Appearance” option to “Use same appearance as Nulab Account.”
Step 2: In Typetalk, go to your Application Settings page. Set the “Appearance” option to “Use same appearance as Nulab Account.”
Step 3: In your Nulab Account, go to the My Profile page. Choose which Appearance option you prefer. You can select Light, Dark, or Use OS settings.
Moving forward, anytime you want to adjust your appearance settings across Backlog and Typetalk you can do so right from your Nulab Account.