To get Envy working with our app you will need to change some code.
In your Shopify Dashboard go to Sales Channels > Online Store
Click on Themes
On the following page click on Actions > Edit code for the Envy theme.
Under the Sections click on the template–product.liquid to edit
Remove the code below from the add to cart button.
id="purchase"replace with this:
style="width: 100%;"