Template:Graph:Chart/styles.css

/* Prevent overflow behavior in mobile skins. */
@media all and ( max-width: 720px ) {
	.mw-graph {
		min-width: 100% !important;
		max-width: 100%;
		overflow-x: auto;
		overflow-y: visible;
	}
}

.mw-graph-img {
	width: inherit;
	height: inherit;
}