functional requirement

In addition to the card can be entered into the formula, I hope to also support the inclusion of a separate formula block, double-click the canvas to add a separate formula block;
Requirements background: as a science and engineering studies, in order to support the visualization of the screen layout, in order to support the visualization of the convenience, only to create cards to join the formula is a little less convenient, in order to separate formulas for the new card is a little unnecessary.

Need card creation, in the whiteboard can refer to the card within the block, and synchronized modification.
Background: Some times, although two knowledge points belong to the same module, but in organizing knowledge, the other part of the other only need to quote a small piece of content, and then as a separate new card, too wasteful.

Need card background can be set completely transparent. The text is still displayed, but the background color of the card is directly set to transparent.

After updating the new version, there is a small bug, when I set the card style, I set the dotted line for the border line, it doesn't change the style, and it doesn't show up when I change the thickness of the line. When I change the color, the border thickness is shown, but the border style remains unchanged.