Why background image isn't contain at header section on Chrome?

I have checked your site but I saw your site work fine. If you still face there issue, you can send me a screenshot for further checking.

please take a look at screenshot taken from Firefox (it’s ok):
http://iv.pl/images/83090635716507168488.png
and Chrome (it’s not contain):
http://iv.pl/images/76003696296134848112.png

Hi,
To resolve this issue, you can add the following code to the style.css file:

@media screen and (-webkit-min-device-pixel-ratio:0) {
    .header .hero-unit {
        padding: 0px 10% 20px;
   }
}

Hope this helps !