Create Design

**This endpoint allows you to create a new design**. You can add a new design by passing data, including a string of HTML email content, to `/designs`. When creating designs from scratch, be aware of the styling constraints inherent to many email clients. For a list of best practices, see our guide to [Cross-Platform Email Design](https://sendgrid.com/docs/ui/sending-email/cross-platform-html-design/). The Design Library can also convert your design’s HTML elements into drag and drop module...