style update for bar gap
style update for bar gap

nlesc-sherlock/punchcardjs,nlesc-sherlock/spiraljs,nlesc-sherlock/spiraljs,nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs,nlesc-sherlock/punchcardjs