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I am using Nord theme in VScode. The block quotes in the markdown files look like this which is very illegible. How to change the text background?

I have tried the followings in User Settings but it not working:

"workbench.colorCustomizations": {
    "textBlockQuote.background": "#ff0000", // changes the markdown preview
    "editor.textBlockQuote.background": "#0000ff", // Property not allowed
    "[Nord]": {
        "textBlockQuote.background": "#ff0000", // changes the markdown preview
    },
},
"editor.tokenColorCustomizations": {
    "textBlockQuote.background": "#ff0000", // Property not allowed
    "editor.textBlockQuote.background": "#ff0000", // Property not allowed
    "[Nord]": {
        "textBlockQuote.background": "#ff0000", // Property not allowed 
        "editor.textBlockQuote.background": "#ff0000", // Property not allowed
    }
},

Answers

The editor colorization comes from a textmate grammar. To override this, you need to use the textMateRules section of editor.tokenColorCustomizations

"editor.tokenColorCustomizations": {
    "[Nord]": {
        "textMateRules": [
            {
                "scope": "markup.quote.markdown",
                "settings": {
                    "foreground": "#f0f"
                }
            }
        ]
    }
}

The scope used here (markup.quote.markdown) is the textmate scope of markdown block quotes. You can use the Developer: Inspect TM Scopes command in VS Code to determine the target scope

Note that VS Code does not support setting the background color of text. This is tracked here