The custom css theme disappears when quitting and relaunching Logseq

When I copy and paste the custom css theme “Dracula,” I get this error message -> "The file has been modified on your local disk! File path: /Users/hilalmilmo/Library/Mobile Documents/com~apple~CloudDocs/Logseq/logseq/custom.css, please save your changes and click the refresh button to reload it.

Anyone knows how to address this? I am new to LogSeq and using it on an M1 Mac. The folder is located on my iCloud.