How to use the leather.utils.Box function in leather

This can then be placed inside an :code:`<svg>` tag to make a complete
        SVG graphic.

        See :meth:`.Chart.to_svg` for arguments.
        """
        width = width or theme.default_width
        height = height or theme.default_height

        if not self._layers:
            raise ValueError('You must add at least one series to the chart before rendering.')

        if isinstance(theme.margin, float):
            default_margin = width * theme.margin

            margin = Box(
                top=default_margin,
                right=default_margin,
                bottom=default_margin,
                left=default_margin
            )
        elif isinstance(margin, int):
            margin = Box(margin, margin, margin, margin)
        elif not isinstance(margin, Box):
            margin = Box(*margin)

        # Root / background
        root_group = ET.Element('g')

        root_group.append(ET.Element('rect',
            x=six.text_type(0),
            y=six.text_type(0),</svg>

height = height or theme.default_height

        if not self._layers:
            raise ValueError('You must add at least one series to the chart before rendering.')

        if isinstance(theme.margin, float):
            default_margin = width * theme.margin

            margin = Box(
                top=default_margin,
                right=default_margin,
                bottom=default_margin,
                left=default_margin
            )
        elif isinstance(margin, int):
            margin = Box(margin, margin, margin, margin)
        elif not isinstance(margin, Box):
            margin = Box(*margin)

        # Root / background
        root_group = ET.Element('g')

        root_group.append(ET.Element('rect',
            x=six.text_type(0),
            y=six.text_type(0),
            width=six.text_type(width),
            height=six.text_type(height),
            fill=theme.background_color
        ))

        # Margins
        margin_group = ET.Element('g')

if not self._layers:
            raise ValueError('You must add at least one series to the chart before rendering.')

        if isinstance(theme.margin, float):
            default_margin = width * theme.margin

            margin = Box(
                top=default_margin,
                right=default_margin,
                bottom=default_margin,
                left=default_margin
            )
        elif isinstance(margin, int):
            margin = Box(margin, margin, margin, margin)
        elif not isinstance(margin, Box):
            margin = Box(*margin)

        # Root / background
        root_group = ET.Element('g')

        root_group.append(ET.Element('rect',
            x=six.text_type(0),
            y=six.text_type(0),
            width=six.text_type(width),
            height=six.text_type(height),
            fill=theme.background_color
        ))

        # Margins
        margin_group = ET.Element('g')
        margin_group.set('transform', svg.translate(margin.left, margin.top))

if not self._layers:
            raise ValueError('You must add at least one series to the chart before rendering.')

        if isinstance(theme.margin, float):
            default_margin = width * theme.margin

            margin = Box(
                top=default_margin,
                right=default_margin,
                bottom=default_margin,
                left=default_margin
            )
        elif isinstance(margin, int):
            margin = Box(margin, margin, margin, margin)
        elif not isinstance(margin, Box):
            margin = Box(*margin)

        # Root / background
        root_group = ET.Element('g')

        root_group.append(ET.Element('rect',
            x=six.text_type(0),
            y=six.text_type(0),
            width=six.text_type(width),
            height=six.text_type(height),
            fill=theme.background_color
        ))

        # Margins
        margin_group = ET.Element('g')
        margin_group.set('transform', svg.translate(margin.left, margin.top))