dart-web

Description
The sidebar toggle (hamburger menu) has too much width on desktop devices and overlaps with the actual menu. This causes the user to accidentally collapse the menu when wishing to navigate to a new section.

Steps To Reproduce

1. Go to the bloclibrary.dev.
2. Click on the last visible menu item next to the sidebar toggle "icon".

@Component(selector: 'test-component',
                   directives: const [NgIf, NgFor],
                   template: 'It works!')
class TestComponent {
...

produces the following HTML:

<test-component>It works!</test-component>

If for some reason you were not really awake and write this:

@Component(selector: 'test-component',
                   directives: cons