Please visit this site:
[Nadpco](http://www.nadpco.com/#/Home?lang=en)

At first load this page, maybe less than one second, you see something like this picture:
![enter image description here](https://i.stack.imgur.com/iAxiA.jpg)

and then every thing will OK.

Likely this is why that, at first content loaded and then css load.

How to I resolve this problem.

Notablyو I used AngularJs and Bootstrap for create this site.

Thanks a lot.