Need help understand with Login background changing

[Ahmed Karawia]

Its a GIF or a video, i wanna replace it with an image cause it lags pc most of the time if someone could help
I am not the owner of the Server.
1.7.6 server

 

[batuirin]

Are you referring to the video that has a dragon?

 

[Ahmed Karawia]

Are you referring to the video that has a dragon?

Nah, i want a noon pic without any animation because it lags pc