Bootstrap v4

Examples

https://www.quackit.com/bootstrap/bootstrap_4/examples/

https://v4-alpha.getbootstrap.com/examples/

https://v4-alpha.getbootstrap.com/components/

https://v4-alpha.getbootstrap.com/components/modal/

https://www.bootstrapcdn.com/alpha/

https://designmodo.com/bootstrap-4-tutorial/

Signin

https://bootsnipp.com/snippets/emRPM