My CSS snippet not working

I’m trying to adjust the spacing between lines. I randomly revised the code in the developer tools, and I think I got the code I needed. I applied the CSS snippet, however, it’s not working.

.markdown-source-view :is(.cm-line + .cm-line) {
   padding-bottom: 0.6em;
   
}


body {
    --h1-line-height: 1.6em;
    --h2-line-height: 1.3em;
    --h3-line-height: 1.2em;
    --list-edit-offset: 0.5em;
    --list-indent: 1.7em;
    --list-spacing: 0.05em;

}


.cm-formatting-list.cm-formatting-list-ul {
	margin-right: 4px;
}
.markdown-rendered .list-bullet {
	margin-right: 4px;
}

Can anyone help fix the problem : ) Thx

I figured out even though I have changed the suffix to .css, it’s still a RTF file.
I downloaded the css file provided below, and my snippet finally worked.

https://forum.obsidian.md/t/unable-to-get-any-snippet-to-work-in-obsidian-please-help/24509/6?u=shuoliu

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