src/vs/editor/common/model/guidesTextModelPart.ts/BracketPairGuidesClassNames/getInlineClassNameOfLevel
class BracketPairGuidesClassNames:	getInlineClassNameOfLevel(level: number): string {
		// To support a dynamic amount of colors up to 6 colors,
		// we use a number that is a lcm of all numbers from 1 to 6.
		return `bracket-indent-guide lvl-${level % 30}`;
	}