diff --git a/_design/share-image.sketch b/_design/share-image.sketch
new file mode 100644
index 0000000..b1cb296
Binary files /dev/null and b/_design/share-image.sketch differ
diff --git a/_src/_assets/img/share-image.png b/_src/_assets/img/share-image.png
new file mode 100644
index 0000000..91361fa
Binary files /dev/null and b/_src/_assets/img/share-image.png differ
diff --git a/_src/_includes/sharing.html b/_src/_includes/sharing.html
index e99ba86..9b25c8c 100644
--- a/_src/_includes/sharing.html
+++ b/_src/_includes/sharing.html
@@ -23,7 +23,7 @@
 {% if page.image %}
     <meta name="twitter:image:src" content="{{ site.url }}/assets/img/{{ page.image }}">
 {% else %}
-    <meta name="twitter:image:src" content="{{ site.url }}/assets/img/share-image.jpg">
+    <meta name="twitter:image:src" content="{{ site.url }}/assets/img/share-image.png">
 {% endif %}