diff --git a/src/maths/diagrams/sets.py b/src/maths/diagrams/sets.py
index a92546a..191e91d 100644
--- a/src/maths/diagrams/sets.py
+++ b/src/maths/diagrams/sets.py
@@ -30,7 +30,8 @@ T2 = TypeVar('T2');
 
 SCALE  = (1., 4.);
 OFFSET = (3., 0.);
-MARGIN = 0.1;
+HMARGIN = 0.1;
+VMARGIN = 0.2;
 N_RESOLUTION = 100;
 ANNOTATE_OFFSET = (0, 10);
 FONTSIZE_PTS = 10;
@@ -84,9 +85,10 @@ class Functions:
             'horizontalalignment': 'center',
             'color': 'forestgreen',
         });
+        axs.set_facecolor((0.9,0.9,0.9))
         mplot.xlabel('');
         mplot.ylabel('');
-        mplot.margins(x=MARGIN, y=MARGIN);
+        mplot.margins(x=HMARGIN, y=VMARGIN);
 
         origin = np.asarray((0., 0.));
         offset = np.asarray(OFFSET);