gganimate has problem of white space in plot area

[ambijat]

The ggnimate produces quite large amount of white space in its right and bottom side area. see pic, I need to know how to get big gifs and a desired dimension to fill the plot area. I am pasting my code as well.
Thanks

ggplot(cxm1, aes(Year, value, color = Flow)) +
scale_y_continuous(labels = comma) +
geom_line() +
geom_point() +
theme(legend.position = "bottom") +
transition_reveal(Year) +
ease_aes('cubic-in-out') +
facet_wrap(~ Country) +
labs(title = "China's Exports and Imports : {frame_along}", y = "Bln Dlrs")

animate(t, 100, 10)

[mara]

Could you please turn this into a self-contained reprex (short for reproducible example)? It will help us help you if we can be sure we're all working with/looking at the same stuff.

install.packages("reprex")

If you've never heard of a reprex before, you might want to start by reading the tidyverse.org help page. The reprex dos and don'ts are also useful.

What to do if you run into clipboard problems

If you run into problems with access to your clipboard, you can specify an outfile for the reprex, and then copy and paste the contents into the forum.

reprex::reprex(input = "fruits_stringdist.R", outfile = "fruits_stringdist.md")

For pointers specific to the community site, check out the reprex FAQ.