diff --git a/pygal/graph/line.py b/pygal/graph/line.py
index da03c90..77ed8b8 100644
--- a/pygal/graph/line.py
+++ b/pygal/graph/line.py
@@ -43,11 +43,11 @@ class Line(Graph):
 
     def _compute(self):
         if self.include_x_axis:
-            self._box.ymin = min(min(self.values), 0)
-            self._box.ymax = max(max(self.values), 0)
+            self._box.ymin = min(min(self._values), 0)
+            self._box.ymax = max(max(self._values), 0)
         else:
-            self._box.ymin = min(self.values)
-            self._box.ymax = max(self.values)
+            self._box.ymin = min(self._values)
+            self._box.ymax = max(self._values)
 
         x_step = len(self.series[0].values)
         self._x_pos = [x / float(x_step - 1) for x in range(x_step)
diff --git a/pygal/graph/radar.py b/pygal/graph/radar.py
index 07666bd..e04ddfa 100644
--- a/pygal/graph/radar.py
+++ b/pygal/graph/radar.py
@@ -82,7 +82,7 @@ class Radar(Line):
     def _compute(self):
         self._box._margin *= 2
         self._box.xmin = self._box.ymin = 0
-        self._box.xmax = self._box.ymax = self._rmax = max(self.values)
+        self._box.xmax = self._box.ymax = self._rmax = max(self._values)
 
         x_step = len(self.series[0].values)
         delta = 2 * pi / float(len(self.x_labels))
diff --git a/pygal/svg.py b/pygal/svg.py
index d377062..a93d499 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -45,7 +45,7 @@ class Svg(object):
     def add_style(self, css):
         style = self.node(self.defs, 'style', type='text/css')
         with open(css) as f:
-            style.text = template(
+            templ = template(
                 f.read(),
                 style=self.graph.style,
                 font_sizes=self.graph.font_sizes,
@@ -54,6 +54,7 @@ class Svg(object):
                 if self.graph.fill else 0,
                 fill_opacity_hover=self.graph.style.opacity_hover
                 if self.graph.fill else 0)
+            style.text = templ.decode('utf-8')
 
     def node(self, parent=None, tag='g', attrib=None, **extras):
         if parent is None: