Learn how to create "notes" with CSS.
Read on how to do it in this link: https://www.w3schools.com/howto/howto_css_notes.asp
Notes
Notes can be used to notify the user about something special: danger, success, information or warning
Try it yourself here: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_danger
Tip: Also check out Alerts.