Font on Admin Bar show black color

After installed Edublogs theme. I found font on Admin Bar, that normally admin bar have black color background and show font with white color. But my admin bar show black font color on Homepage (not admin or dashboard page). Black color font show at Your account, My sites, Update.in.th and Howdy,username. (in logo, +Now show wihite color it's correct)

You can login to see admin bar by access http://www.update.in.th/wp-admin/
Username : test
Password : test123