add 404 page

404.html

@@ -0,0 +1,25 @@
+---
+permalink: /404.html
+layout: default
+---
+
+<div class="error-page">
+	<h2>404</h2>
+
+	<p style="font-size: 1.5rem"><strong>nyat found :(</strong></p>
+	<p>the webbed sewver twied weawwy hawd, pwease don't be angwy se-se-senpai qwq</p>
+</div>
+
+<style type="text/css" media="screen">
+	.error-page {
+		text-align: center;
+		padding: 20px 0;
+	}
+
+	.error-page h2 {
+		margin: 30px 0;
+		font-size: 4em;
+		line-height: 1;
+		letter-spacing: -1px;
+	}
+</style>