Overview#
When using Editor.js, large margins appear on the left and right sides by default. This article introduces how to solve this issue.

Method#
The following was helpful.
https://github.com/codex-team/editor.js/issues/1328
Specifically, add the following CSS.
The full source code is as follows.
As a result, the left and right margins were reduced as shown below.

Summary#
I hope this serves as a useful reference when using Editor.js.