Assuming you want to click everything, say 10px. The following worked fine for me.
body>div { padding: 0 10px }
This will apply 10px indent to the left and right of the child divs of the body.
You will also probably want to change the width of the .container style to something more reasonable. The standard is 940px, so if you are new to padding 10px, you can do it 920px.
In addition, you need to move the background style from the internal .topbar style to the .topbar style. If you do not, then on the top bar there will be no background in which the add-on has been added.
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