If possible, link to a minimal repro (fork this code sandbox):

I expected to see a calender
I have no idea what is going on... spent an hour trying to solve. Can't see anything wrong :/
Looks like you forgot to add the datetime css file.
@import '~@blueprintjs/datetime/lib/css/blueprint-datetime.css';
If you use select or table package they have a separate css file to.
@import '~@blueprintjs/select/lib/css/blueprint-select.css';
@import '~@blueprintjs/table/lib/css/table.css';
Oh damn.. I knew it was something simple 馃憤
thx very much!
Most helpful comment
Looks like you forgot to add the datetime css file.
@import '~@blueprintjs/datetime/lib/css/blueprint-datetime.css';If you use select or table package they have a separate css file to.
@import '~@blueprintjs/select/lib/css/blueprint-select.css';@import '~@blueprintjs/table/lib/css/table.css';