How to make Transfarent color for blogger

Transfarent color for blogger or background

Examples

#content-wrapper {
width: 777px;
margin: 0 auto;
padding: 0 0 5px;
text-align: left;
position: static;
margin-top: 1px;
background-color: #FFFFFF;
filter:alpha(opacity=70); -moz-opacity:0.70; opacity:0.70; -khtml-opacity:0.70;
}

or

#content-wrapper {
width: 777px;
margin: 0 auto;
padding: 0 0 5px;
text-align: left;
position: static;
margin-top: 1px;
background: url (http://.............);
filter:alpha(opacity=70); -moz-opacity:0.70; opacity:0.70; -khtml-opacity:0.70;
}


Note :
Add red color for code opacity
Change blue color for % opacity