A black window pop out after I select a boot entry in grub2

[Huangwei Fang]

Hi everyone,

When I boot a system, system takes me to the grub screen to select a 
boot entry. After I choose a boot entry, a black window pops out within 
the colorful grub screen. In that window, it prints out the "Loading" 
boot archive message and the progress. That black window gives the bad 
visual part of booting a system. I was wondering how can I disable this 
black window pop out. Does anyone know how to do it or can provide any 
help? Thanks in advance.

Best,

Henry