Simple Bitcoin Donation Button. It provides a URL-API of the format
https://coins.github.io/thx/#<address>?label=<label>&message=<message>
Which can be combined with an image button:
CoinThx Url:
https://coins.github.io/thx/#1K9zQ8f4iTyhKyHWmiDKt21cYX2QSDckWB?label=Coins%20Project&message=Thank%20you%20for%20your%20contribution!
CoinThx Markdown for button:
[<img src="https://coins.github.io/thx/logo-color-large-pill-320px.png" alt="CoinThx" width="200"/>](https://coins.github.io/thx/#1K9zQ8f4iTyhKyHWmiDKt21cYX2QSDckWB?label=Coins%20Project&message=Thank%20you%20for%20your%20contribution!)