icontact plugin threw off content in website

I installed an icontact widget so that I could embed a contact form in my website. After installing the widget the content on my webpages got pushed to the right. when I deleted the widget, my webpages went back to the original appearance, so I tried installing the widget again. It threw my pages off again, and this time after I deleted the widget, I could not restore the original layout of my webpages. Please help…this has wasted my entire day.

https://www.ads-software.com/plugins/icontact-widget/