Notify Admins about Plugin Merge

I have two similar plugins that I am merging into one new plugin, in order to make the plugin more efficeient, and to reduce development time when new features are added. The plugins have similar purposes. Both use shortcodes to display content (media or posts) on a page. The plugins are especially useful on a multisite, as they gather content from some or all of the sub-sites.

Trying to use a variable to set image width

I am writing a WordPress plugin that will display a devotional image. One of the options I would like to include is image width. I am trying to wrap the image and some text in a div so I can style it and let the user chose some different styling options. However, just trying to set the div width using the variable is not working. It says there is a syntax error.