Default background color shall either be white or transparent

Definitely not black!

src/hb-view.c

diff --git a/src/hb-view.c b/src/hb-view.c
index c55c423..dcb9571 100644
--- a/src/hb-view.c
+++ b/src/hb-view.c
@@ -50,7 +50,7 @@
 static int line_space = 0;
 static double font_size = 18;
 static const char *fore = "#000000";
-static const char *back = "#000000";
+static const char *back = "#ffffff";
 static const char *text = NULL;
 static const char *font_file = NULL;
 static const char *out_file = "/dev/stdout";