* Use CSS to show/hide menu instead of using React state. Menu and overlay hidden by default

* Overlay is grey to make it clear the user's Call to Action (CTA) is to select a menu item

* Use can click overlay to close menu

* Remove close icon

* Remove spacer line

Update @parity/* packages & fix #298

Add Max button to send the whole balance

docs: Add troubleshooting tip suggesting to reload when stuck on white screen

fix: Fixes #244. Concatenate balances to 2 decimal places on account overview page without rounding