XF 2.0 How can I change this bar's color?

What is the this bar's name in Xenforo? I can't find the way to change it's color in my Style Properties. Can you show me?


@KawaiiHannah thank you very much for your suggestion. I do like this (write here if anyone need to help).
1. Sign in your Admin Control Panel
2. Go to Appearance - your Style Properties and choose Basic colors
3. You can choose the color you want in Highlighted content background color