CSS is being stripped of its negative symbol.

[mullanaphy]

To test, minify:

ul.pagination {
display: block;
min-height: 1.5rem;
margin-left: -0.3125rem;
}

Results in:

ul.pagination{display:block;min-height:1.5rem;margin-left:0.3125rem}

Seems the shortenZeros regex is being a little greedy and doesn't care for decimals. Temporary fix for me is changing all of "0." to just ".".

/(?<![0-9])-?0(%|px|em)?/i => matches -0.3125rem

[matthiasmullie]

Thanks for the report! f5d1bd2 will fix that & I'll publish a new release in a minute!