Gadget-MainPageStyle.css

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/* CSS styling and responsive support for the main page */

/* Site styles */
.containerContent > ul:first-of-type {
	margin-top: 0 !important;
	margin-bottom: 0 !important;
	margin-right: 0.75em !important;
}

/* Responsive fixes */
@media all and (max-width: 719px) {
	#mp-container {
		overflow: visible !important;
	}
	#mp-container > tbody > tr > td,
	.mp-community > tbody > tr > td {
		display: block !important;
		width: auto !important;
		padding: 0 !important;
	}
	body .containerTem .floatleft,
	body .containerTem .floatright {
		margin-top: 0 !important;
	}
	.containerContent input.mw-ui-input {
		width: 70% !important;
	}
	.containerTem {
		width: auto !important;
	}
}

MediaWiki:Gadget-MainPageStyle.css