gutenberg test against astra

[ineagu]

Astra https://interested-gannet.jurassic.ninja WP user: demo /pass : kdcNIXqApThB

Neve https://inexpensive-caiman.jurassic.ninja WP user: demo / pass : HVJHtTJgAA5j

1. I have imported a gutenberg demo built with UABB on both themes, on Neve seems that the container stays too small : https://www.dropbox.com/s/bog5frn65rly3kv/Screenshot%202019-03-25%2014.38.57.png?dl=0, while on Astra in ok ( in admin), can we make sure there aren't any issues on our side?

2. We show the scrollbar even when the page is empty, which makes no sense : https://www.dropbox.com/s/vy7eb0l9e8hp4kx/Screenshot%202019-03-25%2014.42.24.png?dl=0

3. Small glitch : https://www.useloom.com/share/e6ff9db072eb48db830e9095df4373b0

4. I was using Otter to create a simple page on both, 2 sections, while on both the page in editor is quite slow, seems to be slower on Neve? ( you can test on instances)

5. Those options got me confused a bit, what is contained vs stretched? How I can easily keep the content centered on the page like by default?

6. This is more a Otter issue, however as a reminder, if you test the Homepage built with UABB vs no title page built with Otter on both themes, you would likely see that Otter one isn't really editable, even on latest Gutenberg version.

cc @rodica-andronache