change opening tag from canvas to div

[a-sumo]

No description provided.

[jmarcosfer]

Thanks for the suggestion @a-sumo.

First, please submit your PRs to the dev branch instead of master.

From what I can see we don't need to convert the canvas element into a div. Instead, the canvas element needs a closing tag and then we need a newline at L52 and correct the indentation of the closing div tags.