I solved this problem myself. Just putting in everything in the widget “text”.
But the google+-post doesn`t fit in. Overwriting the css “.g-post” or “.Yc” doesn’t work.
You would typically add the first part to GP Hooks in the wp_footer hook.
As for the width, maybe you can set it in the settings where you got the code from? If not, you can increase the width of the sidebar by using the Spacing add-on or increasing the Container Width in the Layout section.