add art gallery and tweak header

i think that the pictures are just placeholders now. i will try to
improve this 'gallery' a bit later.

also, header is now fixed with transparent background.

1 files changed, 13 insertions, 1 deletions

diff --git a/art.md b/art.md
index 6f24a8e..a541b2b 100644
--- a/art.md
+++ b/art.md
@@ -3,4 +3,16 @@ title: art
 permalink: /art/
 ---
 
-here i'll show some graphical stuff
+{% assign image_files = site.static_files | where: "art", true %}
+
+here are some photos and pictures.
+
+feel free to use them if and as you wish (don't forget to attribute).
+
+<div class="art">
+{% for img in image_files %}
+    <div class="art-img">
+        <img src="{{ img.path }}" alt="{{ img.name }}">
+    </div>
+{% endfor %}
+</div>