Pulsating Red Box

Write a program to create a box with animation as shown in gif below.

Acceptance Criteria

1. The program should create a box on the webpage.
2. The box should have a width and height of 100px.
3. The box should have a red background-color.
4. The box should have a pulse animation applied to it.
5. The pulse animation should last for 1 second.
6. The pulse animation should ease-in and ease-out.
7. The pulse animation should repeat infinitely.

Example

It should look like this