[recipes] Fix recipe tile image sizing

[Matthias Clasen <matthiasc src gnome org>]

commit 877199098695916bfce6c1d28e528c332f0fef5a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 7 14:36:50 2017 -0500

    Fix recipe tile image sizing
    
    We don't want the fallback image to peek through, so use 'cover'
    for the sizing.

 src/gr-recipe-tile.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/gr-recipe-tile.c b/src/gr-recipe-tile.c
index 925bfb7..9ce3f96 100644
--- a/src/gr-recipe-tile.c
+++ b/src/gr-recipe-tile.c
@@ -76,8 +76,8 @@ add_recipe_css (GrRecipe *recipe,
 
                 g_string_append_printf (css, "box.recipe.%s {\n", id);
                 g_string_append_printf (css, "  background: url('%s');\n"
-                                             "  background-size: 100%%;\n"
-                                             "  background-repeat: no-repeat;\n", ri->path);
+                                             "  background-size: cover;\n"
+                                             "  background-position: center;\n", ri->path);
                 g_string_append (css, "}\n\n");
         }
 }