Add the following to your settings.json:
"workbench.colorCustomizations": {
"terminal.ansiBlack": "#000",
"terminal.ansiBrightBlack": "#676767",
"terminal.ansiRed": "#c91b00",
"terminal.ansiBrightRed": "#ff6d67",
"terminal.ansiGreen": "#00c200",
"terminal.ansiBrightGreen": "#5ff967",
"terminal.ansiYellow": "#c7c400",
"terminal.ansiBrightYellow": "#fefb67",
"terminal.ansiBlue": "#0225c7",
"terminal.ansiBrightBlue": "#6871ff",
"terminal.ansiMagenta": "#c930c7",
"terminal.ansiBrightMagenta": "#ff76ff",
"terminal.ansiCyan": "#00c5c7",
"terminal.ansiBrightCyan": "#5ffdff",
"terminal.ansiWhite": "#c7c7c7",
"terminal.ansiBrightWhite": "#fffefe"
}