It seems like the Playground is not working as expected:

Dependencies:
I'm having the same issue with the playground not working.
It loads, but with a blank view except for the "previous" button. Clicking on the previous button gives a flash of the 4 kitten images, then they disappear. From that point on any subsequent clicks on "previous", or scrolling left to right, shows nothing.
This is possible related to a previous issue reported: https://github.com/akiran/react-slick/issues/1264
It's working,
you just need to move link on index.html to resource view this link or image bellow

Thank you @antandev, this does indeed solve the issue in the Playground. I wonder if this issue should be closed or kept open until the playground is corrected, as it is linked in the docs:

Confirmed on my end too... It does work when using the "Add Dependency" button to add the slick carousel CSS files instead of directly linking to them in index.html.
Also, I'm agreeing with @jvaloria, till the playground is updated this should be kept open.
also if you getting arrows out of view , just cut container style from index.html to styles.css file , you will get nicer look at least ,
i'm just wondering how to import these styles with react ????? doc really confused me with styles ....
Playground is working now
Thank you!
Most helpful comment
It's working,
you just need to move link on index.html to resource view this link or image bellow