Use a custom svg class for your rest book svg elements

[RandomFractals]

Setting all svg elements width to 20px breaks renderers that use REST book for pulling data for display.

See: https://github.com/RandomFractals/vscode-leaflet/issues/31#issuecomment-939485246

This needs to be changed in your stylesheet: https://github.com/tanhakabir/rest-book/blob/main/src/custom-renderer/style.css#L46