I've created a global css like (see [jsfiddle](https://jsfiddle.net/unn265ko/20/)) ``` Glamor.css.global(".hello", { ":hover": { "opacity": 0.7 }, "opacity": 0.3, } ``` and it transforms to ``` ".hello{opacity:0.3;:hover:[object Object];}" ``` but not ``` .hello { opacity:0.3; } .hello:hover { opacity:0.7; } ```