If you also use the HighlightMatchingTag extension in VS Code and want to make underscores and marks on the right gutter be different colors set the settings:

"highlight-matching-tag.styles": {
        "opening": {
            "name": {
                "custom": {
                    "dark": {
                        "overviewRulerColor": "yellow"
                    },
                },
                "underline": "#839496",
            }
        }
    },

for dark theme. light for light)