Sizing and Positioning of Classic Block off on Page

Hi, I inserted a Classic block on one of my pages to display a Jotform report. I have the Jotform oEmbed plugin and inserted the html of the Jotform report into the Classic block which I inserted on to the page. The report displays on the page, but it is very large and it is shifted to the right of the page so that part of the chart cannot be viewed. Is there a way to centre the viewing area of the report and maybe reduce the overall size so that the entire report can be seen? I can't seem to attach a screenshot here so I hope that my explanation is sufficient. If someone could help ASAP that would be greatly appreciated. This is a time sensitive project. Thank you.