kollapsminoriteten/wp-content/plugins/jetpack/modules/subscriptions/subscribe-floating-button/subscribe-floating-button.css

.jetpack-subscribe-floating-button {
	position: fixed;
	z-index: 50000; /* Same as WP.com Action bar */
	bottom: 0;
	right: 0;
}

@media screen and (max-width: 640px) {

	.jetpack-subscribe-floating-button {
		display: none;
	}
}