On a long file or method, it is nice to see where you are at a glance (see the discontinued line number).

It's possible with stickyScroll. The default contrast is low but you can change them in colorCustomizations.

// settings.json
    "editor.stickyScroll.enabled": true,
    "workbench.colorCustomizations": {
        "editorStickyScroll.background": "#5d5252",
        "scrollbar.shadow": "#fcfcfc"
    }