Copy this HTML code and use it on your website:
<iframe src="https://minecraft-list.org/server/25944-fb.kiwimc.pl/widget" allowtransparency="true" width="320" height="80" frameborder="0"></iframe>

Set width to 768px+ to use full size widget (with motd).

https://minecraft-list.org/server/25944-fb.kiwimc.pl/json

Example usage: PHP