E301 - Both width and height are "auto"

Cause

An element has both width: "auto" and height: "auto". At least one dimension must be a numeric percentage or animated so the auto-sized dimension has a reference to compute against.

Example

{ markdown: "...", width: "auto", height: "auto" }

How to fix

Give either width or height a numeric value: width: 50 (percent of viewport) or animate one of them.