PrismHighlight/prism/plugins/prism-show-invisibles.css

.token.tab:not(:empty):before,
.token.cr:before,
.token.lf:before {
	color: hsl(24, 20%, 85%);
}

.token.tab:not(:empty):before {
	content: '▸';
}

.token.cr:before {
	content: '␍';
}

.token.lf:before {
	content: '␊';
}