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Hi @putri12, you can find the correct dimensions for different social media banner sizes and thumbnails with a quick search.
For example, type in "Twitter Banner Size" - and you'll get a number of results.

here's a good one for 2018

https://blog.snappa.com/twitter-header-size/

For a Twitter banner/header the optimal size is 1500 pixels wide by 500 pixels tall.



Hope this helps :)

thank you very much for the information :)

If I want to make cover art and banner, do I have to make two different posts?

No, you can put them together in 1 post. Just make sure to let us know which is which, thanks ;)

Hello
Pls when is the announcement of the contest winner