Answer
Version 1.12 introduced new workbench theming options (they were experimental in 1.11).
There is a setting for the color of line numbers:
"workbench.colorCustomizations": {
"editorLineNumber.foreground": "#999999"
}
Some themes also define current line number:
"workbench.colorCustomizations": {
"editorLineNumber.activeForeground": "#555555"
}
See the Theme Color Reference.
Attribution
Source : Link , Question Author : krv , Answer Author : G-Man Says ‘Reinstate Monica’