Answer for Background image on mobile device won't resize correctly

Hello, just find out how to remove the parallax background on mobile device. It remove on all mobile device but keep the parallax on desktop or bigger display. It seem like the best solution for me for the moment, as it doesn’t look crappy but really awesome with the classic black background on mobile.
Just add this code on the media queries, in the responsive.css file, in layout folder, for all .parallax-section :

background-attachment: scroll;
background-position: top;
-webkit-background-size: auto;
-moz-background-size: auto;
background-size: auto;

Thanks a lot for you theme, i really love you work!