Whale Mo

Just use `template class` to generate used ISR functions instead of switch/case them all. Here is a ref: [Use template class member function for ISR](https://kouga.us/arduino-develop-1/)

[enhance] Use background image on Misskey - Update style.scss

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## What Add default background image styles. For better show an image as centered, cover size, and no repeat. And can be modified by CSS vars. ## Why By default,...

Let the background image fit the web view.

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## Summary Right now, if we use an image as Misskey background, normally we got nothing show at all. Then we need to setup the Theme for transparent, but got...