The layout is odd because of some tradeoffs that I had to make when creating the default layout of the loader. By default, this plugin is meant to be used as a block-type element, not a full-page.

To make this work as a full-width section, add the data-full-width-loader class to the installation <div>. 

<div data-wm-plugin="load"
  data-full-width-loader 
  data-target="/url"
></div>
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Getting this to work with MailerLite