Bug: With title container's class not working anymore

[guastallaigor]

Describe the bug The container with-title class is not working anymore.

To Reproduce Check out the containers in index.html master and develop or run storybook.

Expected behavior The with-title class in intended to let the container look like a fieldset.

Screenshots

Environment:

• OS: Ubuntu 18.04
• Browser: Chrome 71.0
• Build environment (i.e. NodeJS): Node v9.11.1

Suggestion(s) for fixing this issue Check out the latests changes made in the container and revert it, or maybe some class is mising.

Additional context I'm looking into it but got nothing so far.

[guastallaigor]

Also, container the border-white of the container is-dark class is gone:

But I will open a new issue for this later.