MediaWiki:Gadget-ResponsiveStyle.css

/* Responsive CSS applied to both desktop and mobile */

/* Mobile phone */
@media all and (max-width: 719px) {
	/* User board */
	.user-board-message {
		width: auto !important;
	}
	.user-page-message-form textarea {
		width: 100% !important;
	}
}

/* Desktop/tablet */
@media all and (min-width: 720px) {
	/* User profile */
	#user-page-left > .profile-info-container > div {
		width: 50%;
		float: left;
	}
}