diff --git a/404.html b/404.html
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--- /dev/null
+++ b/404.html
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+<!doctype html>
+<html>
+  <head>
+    <title>The page you were looking for doesn't exist (404)</title>
+    <style type="text/css">
+      body {
+        background-color: #fff;
+        color: #666;
+        text-align: center;
+        font-family: arial, sans-serif;
+      }
+      div.dialog {
+        width: 25em;
+        padding: 0 4em;
+        margin: 4em auto 0 auto;
+        border: 1px solid #ccc;
+        border-right-color: #999;
+        border-bottom-color: #999;
+      }
+      h1 {
+        font-size: 100%;
+        color: #f00;
+        line-height: 1.5em;
+      }
+    </style>
+  </head>
+
+  <body>
+    <div class="dialog">
+      <h1>The page you were looking for doesn't exist.</h1>
+      <p>You may have mistyped the address or the page may have moved.</p>
+    </div>
+    <img
+      src="/assets/images/404-acara.png"
+      alt="A Ghost Acara wearing the 404 Shirt"
+      title="Boo!~"
+      width="300"
+      height="300"
+    />
+  </body>
+</html>
diff --git a/assets/images/404-acara.png b/assets/images/404-acara.png
new file mode 100644
index 0000000..051d406
Binary files /dev/null and b/assets/images/404-acara.png differ
