Modals must have an animation

### Issue type

**I'm submitting a ...** (check one with "x")

* [x] bug report
* [x] feature request
* [x] question about the decisions made in the repository

### Issue description

**Current behavior:**

When I click on a modal to display, I see no fadeIn fadeOut animation.

**Expected behavior:**
I want that modals open with animation so user can feel something is opening or closing, like material and bootstrap.