# gulp - One problem i found when i use CSS minify with some CSS library

When i use pure.

And i use gulp as my front-end build tool.

I used cssmin as my CSS minify tool.

By default it can extreme compress CSS file.

The one problem happen!

display not match

Because use CSS minify can remove inherited CSS property.

So in webkit browser doesn’t has display: -webkit-flex; and layout will be an error.

But this is not a bug, it is a feature.

It can avoid inherited CSS property and it can decrease CSS file size.

But in this case, it is not good feature.

So i need add option in my gulp file.

cssmin({
    aggressiveMerging: false
})

It represent to aggressive merging of CSS properties.