How do I make my content background translucent?

You need to show us the webpage you’re talking about

If you’re not using a Child Theme, and if the theme doesn’t have a designated section of the dashboard for CSS modifications then install this Custom CSS Manager plugin http://wordpress.org/plugins/custom-css-manager-plugin

Then use its “CSS Code” section of the dashboard to hold your CSS modifications:

Alternatively use your Child Theme style.css file to hold your CSS modifications:

.site {
    background: transparent;
}

Try this:

.site-content,
.site {
    background: transparent;
}