To change the width, what you need to change is this line: "#canvas { width: 60em; }". Try something like "#canvas { width: auto; }" in your custom css. Don't change the width of #content, that will mess with the sidebar the way you're seeing.
You don't need to make the layer public if you don't want; that just means that other people can see it. You might want to keep it public for a little, in case you need more trouble-shooting, though!
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To change the width, what you need to change is this line: "#canvas { width: 60em; }". Try something like "#canvas { width: auto; }" in your custom css. Don't change the width of #content, that will mess with the sidebar the way you're seeing.
You don't need to make the layer public if you don't want; that just means that other people can see it. You might want to keep it public for a little, in case you need more trouble-shooting, though!