Indentation for list in live preview

What I’m trying to do

I want to reduce the indentation for all kinds of list in live preview mode as the picture below.
image

Things I have tried

I have tried some of the snippets from this thread:

/* snippet 1  */
body {
  --list-indent: 15em;
}
/* snippet 2 */
:root {
  --list-indent: 15em;
}

/* Apply the list item indentation */
.markdown-preview-view ul, .markdown-preview-view ol {
  margin-left: var(--list-indent);
}

And none of them had any mere effects on my list text.

Are there any CSS snippets I can try to make the list indent like the picture above?

Thank you in advance!