Preview:
$('.page-header').css({
  '-webkit-transform' : 'translateY(' + topbarHeight + 'px)',
  '-moz-transform'    : 'translateY(' + topbarHeight + 'px)',
  '-ms-transform'     : 'translateY(' + topbarHeight + 'px)',
  '-o-transform'      : 'translateY(' + topbarHeight + 'px)',
  'transform'         : 'translateY(' + topbarHeight + 'px)'
});
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Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter