How do I find the CSS name for a specific part?

[SuppliedOrange]

Hi, as you can see here these backgrounds aren't following the colour scheme. I would like to try and update it myself, but I don't know what CSS property it uses. The web version of discord uses background-secondary but that doesn't seem to be the case for the mobile version. Could I get some help figuring this out or will you release an update yourself?

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