For this exercise you have to use bootstrap 3: https://getbootstrap.com/docs/3.3/
Please fill the following plunker with your solution: https://plnkr.co/edit/tpl:FIOxisAua3BmA1rucB8a?p=preview
You have to create a page which look like this:
block 1, 2, 3, 4 should be responsive:
Blocks rendering on tablets:
Blocks rendering on mobiles:
When you click on 'lean more' you should open a modal like this:
When you click Ok in the modal and the firstname is not filled, add a red border:
When you click Ok in the modal you should display a message with the firstname at the top of the page like the following image (this message should be automatically hidden after 5 seconds).