@media
 screen and (max-width: 540px),
 screen and (orientation: portrait) {
	.main.back{
		display: block;
	}

	/* Main Part */
	.main.pane{
		max-width: 100%;
		max-height: 50%;
		width: 100%;
		height: 50%;
	}

	/* Preferences Pane */
	.main.pane.preferences-pane{
		max-width: 720px;
		margin: 0px auto;
	}

	/* Preview Pane */
	.main.pane.preview-pane{
		padding: 16px;
	}
}