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It doesnt render correctly on firefox but does in edge, its a rectangle, not a square.
Since the scaling is based on the font size, using `em` + `line-height: 1` allows it to scale correctly by adding it to
`.sudoku-field`.
Fixing it by wrapping the numbers and adding `height: 100%` fixes the individual cells, but the whole table is still a
rectangle but causes the cells to overlap.
There is a bunch of unused code
Autosolver is broken, I had to move the function around
Switched .forEach to for loop for performance (recommended practice)
Convert the keyboard key lookup to a map, mostly stylistic but I imagine its also easier to edit.
Not sure why there is a col and row class that manages cells if the layout is flat
Getters, setter, properties, functions and constructors are all mixed together, it's hard to read
A custom event manager is used, EventTarget is built into the browser not sure why its not used
Usage of `_` instead of `#` for private variables
It's not recommended to setup the elements in the constructor https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#implementing_a_custom_element
You can use `||=` for assigning to an undefined variable (if it's undefined)
Borders are on all grid elements, causing a double border on the edges