CSS Alert Boxes
CSS Alert Boxes are an easy way to add a pop-up window to your website. This can be used for a variety of uses, including:
A site notification that something has happened
A message that is being sent to your users via email
A warning about an important security issue on your site

See the Pen Pure HTML + CSS alerts with dismiss. by Robert Lemon (@rlemon) on CodePen.
Title:- Pure HTML + CSS alerts with dismiss.
Author:- Robert Lemon
Made with :- HTML CSS JS

See the Pen Simple css alerts by Stanislav (@golcinho) on CodePen.
Title:- Simple css alerts
Author:- Stanislav
Made with :- HTML CSS JS

See the Pen Icons Sweet Alert Personnalisé by KAM3LEON (@Kam3leoN) on CodePen.
Title:- Icons Sweet Alert Personnalisé
Author:- KAM3LEON
Made with :- HTML CSS JS

See the Pen CSS Alert Box by mskashef (@mskashef) on CodePen.
Title:- CSS Alert Box
Author:- mskashef
Made with :- HTML CSS JS
See the Pen Daily UI#011 | Flash Message (Error/Success) by Julie Park (@juliepark) on CodePen.
Title:- Daily UI#011 | Flash Message (Error/Success)
Author:- Julie Park
Made with :- HTML CSS JS
See the Pen error, success, warning and alert Messages by Swarup Kumar Kuila (@uiswarup) on CodePen.
Title:- error, success, warning and alert Messages
Author:- Swarup Kumar Kuila
Made with :- HTML CSS JS

See the Pen Error, Success, Warning and Info Messages by Alex Dobson (@DobsonDev) on CodePen.
Title:- Error, Success, Warning and Info Messages
Author:- Alex Dobson
Made with :- HTML CSS JS
See the Pen Simple Confirmation Popup by Adventures in Missions (@adventuresinmissions) on CodePen.
Title:- Simple Confirmation Popup
Author:- Adventures in Missions
Made with :- HTML CSS JS

See the Pen Simple Register Form with AngularJS & Material Design by Sylvain MARTIN (@sylvmrtn) on CodePen.
Title:- Simple Register Form with AngularJS & Material Design
Author:- Sylvain MARTIN
Made with :- HTML CSS JS

See the Pen Google Maps Example: Nightly by Ionic (@ionic) on CodePen.
Title:- Google Maps Example: Nightly
Author:- Ionic
Made with :- HTML CSS JS
See the Pen Notifications, Alerts, Modals by DevTips (@devtips) on CodePen.
Title:- Notifications, Alerts, Modals
Author:- DevTips
Made with :- HTML CSS JS
See the Pen SweetAlert2 by Rio Dwi Prabowo (@riyos94) on CodePen.
Title:- SweetAlert2
Author:- Rio Dwi Prabowo
Made with :- HTML CSS JS
See the Pen Pure CSS Option ( radio & checkbox ) No JS by Aron (@aron-tw) on CodePen.
Title:- Pure CSS Option ( radio & checkbox ) No JS
Author:- Aron
Made with :- HTML CSS JS
See the Pen Generate Bootstrap Alerts with Javascript by Cody Sechelski (@codysechelski) on CodePen.
Title:- Generate Bootstrap Alerts with Javascript
Author:- Cody Sechelski
Made with :- HTML CSS JS

See the Pen Loading like iOS by ks9 (@koheishingai) on CodePen.
Title:- Loading like iOS
Author:- ks9
Made with :- HTML CSS JS

See the Pen Modern Alerts by MohammadReza keikavousi (@keikaavousi) on CodePen.
Title:- Modern Alerts
Author:- MohammadReza keikavousi
Made with :- HTML CSS JS
See the Pen Error message banner by Guillaume (@gumariot) on CodePen.
Title:- Error message banner
Author:- Guillaume
Made with :- HTML CSS JS

See the Pen #011 UI daily challenge – flash message by Dragos Nedelcu (@dragos193) on CodePen.
Title:- #011 UI daily challenge – flash message
Author:- Dragos Nedelcu
Made with :- HTML CSS JS

See the Pen Message Types by Chris Burnell (@chrisburnell) on CodePen.
Title:- Message Types
Author:- Chris Burnell
Made with :- HTML CSS JS

See the Pen Warning, Info and Error css by Audun (@audedesigns) on CodePen.
Title:- Warning, Info and Error css
Author:- Audun
Made with :- HTML CSS JS
See the Pen Password error animation by Aaron Iker (@aaroniker) on CodePen.