add custom background to shopify theme

Hi,
We would like to add a custom background to our site - http://www-helpinghandz-com.myshopify.com/
In an effort to resolve this I found the below code within the style.css for Launchpad. After many attempts to set the background url we can’t get bg.png to show. The question:
What is the syntax or what do we need to change to get the background to work properly?

Image url: http://cdn.shopify.com/s/files/1/0353/6305/files/bg.png?677 
___________________________________________

html,body { margin: 0; padding: 0; border: 0; background-color: {{ settings.shop_bg_color }}; }
html { font-size: 62.5%; -webkit-touch-callout:none; -webkit-text-size-adjust:none; -ms-text-size-adjust:100%; }
body { line-height: 1.45em; font-size: 14px; color: {{ settings.body_font_color }}; font-family: {{ settings.base_font | remove: 'Google+' | replace: '+', ' ' }}; }

{% comment %}

Commented out CSS for background for easy background image uploading in case customers ask. Simply upload a file called 'bg.png' and delete lines as necessary.

html{
  background: url({{ 'bg.png' | asset_url }}) 0 0 repeat scroll;
  background: url({{ 'bg.png' | asset_url }}) 0 0 no-repeat scroll;
  background: url({{ 'bg.png' | asset_url }}) 0 0 repeat fixed;
  background: url({{ 'bg.png' | asset_url }}) 0 0 no-repeat fixed;

  /***dat fullscreen background***/
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
{% endcomment %}
sio2yAsked:
Who is Participating?
 
sio2yAuthor Commented:
Resolution:

We were uploading the image bg.png to files not assets. once we uploaded to assets it showed perfectly.
0
 
sio2yAuthor Commented:
This is what we have now:

background: url({{ 'bg.png' | asset_url }}) 0 0 no-repeat fixed;

Still not showing.
0
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