- Do you want to request a feature or report a bug?

Bug

- What is the current behavior?

2 column layout has minimum width of 800px. Layout is cropped below that.

- If the current behavior is a bug, please provide the steps to reproduce.

Resize browser to below 800px.

- What is the expected behavior?

2 columns collapse in to 1 column, Quick Add & Logout buttons fold under Content and Media links.

Issue 411 is entitled 'Make the CMS work for mobile' - however, this issue is far more limited in scope (and thus easier to implement) and doesn't concern itself with mobile specific problems:
#441

- Please mention your versions where applicable.

Netlify CMS version: ^1.0.0
Browser version: Firefox 59.0.2
Node.JS version: v8.9.1
Operating System: MacOS 10.13.4

- Please link or paste your config.yml below if applicable.