Background transparency

[wintry grove]

Hello! Is there any reason why this isn't working? https://raincode.miraheze.org/wiki/MediaWiki:Vector.css

I don't think it's a cache issue, being that I went from a test setting .mv-body to red, which worked, and refreshed to be back to solid white. How does one add transparency to the Wiki's background?
(Note that the settings I wrote for now aren't definitive, I tried putting the transparency very high to see if it would make a difference.)

Thank you for your help!

[feral forge]

i assume you want it to look like this:

i added this to achive that, it originally was white

.mw-page-container {
    background: none;
    border: none;
}