diff --git a/assets/style.css b/assets/style.css
index cb5fdef..4acf0e8 100644
--- a/assets/style.css
+++ b/assets/style.css
@@ -30,7 +30,7 @@ div, span, a, input {
 body {
     width: 782px;
     margin: 0 auto;
-    background: #ccc;
+    background: #ccc url(bg.png) no-repeat center;
     color: #000;
     font-size: 14px;
     font-family: Tahoma, Arial, Verdana, Meiryo, "MS Gothic", sans-serif, Lucida Sans;
diff --git a/web.lua b/web.lua
index 199259a..bf561d3 100644
--- a/web.lua
+++ b/web.lua
@@ -285,7 +285,7 @@ local app = turbo.web.Application:new(
    {
       {"^/$", FormHandler},
       {"^/api$", APIHandler},
-      {"^/([%a%.]+)$", turbo.web.StaticFileHandler, path.join(ROOT, "assets/")},
+      {"^/([%a%d%.%-_]+)$", turbo.web.StaticFileHandler, path.join(ROOT, "assets/")},
    }
 )
 app:listen(opt.port, "0.0.0.0", {max_body_size = CURL_MAX_SIZE})
diff --git a/webgen/assets/bg.png b/webgen/assets/bg.png
new file mode 100644
index 0000000..cb1b548
Binary files /dev/null and b/webgen/assets/bg.png differ
diff --git a/webgen/assets/src/chibi_20162765420.png b/webgen/assets/src/chibi_20162765420.png
new file mode 100755
index 0000000..c0d73a4
Binary files /dev/null and b/webgen/assets/src/chibi_20162765420.png differ
diff --git a/webgen/assets/src/chibi_20162765420.txt b/webgen/assets/src/chibi_20162765420.txt
new file mode 100644
index 0000000..ffd65f9
--- /dev/null
+++ b/webgen/assets/src/chibi_20162765420.txt
@@ -0,0 +1 @@
+chibi_20162765420.png was generated by http://tetrabo.com/chibichara/
diff --git a/webgen/assets/src/chibi_2x.png b/webgen/assets/src/chibi_2x.png
new file mode 100644
index 0000000..7a8451e
Binary files /dev/null and b/webgen/assets/src/chibi_2x.png differ
diff --git a/webgen/assets/style.css b/webgen/assets/style.css
index cb5fdef..4acf0e8 100644
--- a/webgen/assets/style.css
+++ b/webgen/assets/style.css
@@ -30,7 +30,7 @@ div, span, a, input {
 body {
     width: 782px;
     margin: 0 auto;
-    background: #ccc;
+    background: #ccc url(bg.png) no-repeat center;
     color: #000;
     font-size: 14px;
     font-family: Tahoma, Arial, Verdana, Meiryo, "MS Gothic", sans-serif, Lucida Sans;