if typeof(v) == 'unit' && unit(v) == 'px'
responsive_css_rules[k] = floor(unit((v / parent_width) * 100, '%'), 4)
top['responsive_css'][selector] = responsive_css_rules
if typeof(v) == 'unit' && unit(v) == 'px'
responsive_css_rules[k] = floor(unit((v / parent_width) * 100, '%'), 4)
top['responsive_css'][selector] = responsive_css_rules