from https://www.ibm.com/support/knowledgecenter/SSQNUZ_1.2.1/com.ibm.icpdata.doc/dsx/markd-jupyter.html
Blue boxes (alert-info)
Tip: Use blue boxes (alert-info) for tips and notes.
If it’s a note, you don’t have to include the word “Note”.
Yellow boxes (alert-warning)