GitHub - codephi/custom-alert: Override the alert () and confirm () functions of JavaScript, allowing you to customize them. This application does not use jQuery or another framework, just JavaScript and CSS. Responsive
Custom Alert Popup Box using HTML CSS & Javascript - YouTube
Bootprompt – Alert, Confirm and Dialog Boxes with Bootstrap | jQuery Plugins
How can I make a custom javascript alert() box like the one in the snap website? - Advanced Topics - Snap! Forums