Remove the wrapper to avoid layout issue

In fact, the wrapping `<div>` does not fit the whole page and prevents the root element of a page to take 100% of the page height.

resolves #162
1 job for issue-162-extra-div in 4 minutes and 10 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #868
npm-test

00:04:10