Block.js is the engine for Droppy's blocks.
To create a block, create an <img> element with the class droppyBlock. The src should be https://img.shields.io/badge/BlockType-BlockName-Color?style=for-the-badge (replace BlockType, BlockName, and Color with the corresponding values). Available colors can be found at https://shields.io/#colors. Set the alt text to the code that your block represents. Then, add the JavaScript from https://raw.githubusercontent.com/droppycode/blockjs/master/block.min.js and use blockjs.initialize() to finish setting everything up.