1- Content: The alert content.

2- Layout: You can check the Alert layout from here.

3- Dismissible: Display X close button to temporary dismiss the alert message.

4- Element extra class: Assign a css class to the alert (useful for custom css styles).

CSS Animation: You can animate the alert by selecting the animation you would like.
CSS animation delay: The animation delay in (seconds) format EX: 0.25