If you take a look at Samsung Notes
it has a Zoom-Out option to 50%
which you can have a good view of your text
I really encourage you to make the same ,
it is really important
I will attach the screen shot
I’m not sure I understand. Do you mean to set a readable width for the note area, but also have a different colour for the background?
If that’s what you mean, you can set “Readable line length” in settings. And then you can use a CSS snippet to change the colour of the margins. And adjust the width of the area as well.
You are speaking in terms of “zooming”, and software that people here aren’t necessarily familiar with.
I asked if you meant the colours of the background as an appearance. Or is specifically the pinch-to-zoom gesture? Are you asking about appearance, or a gesture?
If you mean the colours and appearance, these tags might be what you need. If you add a CSS snippet, you can set the background colours like my screenshot below:
I also added some padding:10px so the text has a bit of room from the white edges, like in your video.
And then when you use the zoom commands in Obsidian, that white area will shrink and grow. So will the font size. If that isn’t what you mean, I’m afraid I don’t know white feature of the video you are trying to emphasize.