diff --git a/404.html b/404.html
new file mode 100644
index 0000000..b51a05d
--- /dev/null
+++ b/404.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<html>
+
+<head>
+  <meta charset="UTF-8" />
+  <style>
+    :root {
+      --foreground: #ffffff;
+      --background: #000000;
+
+      --accent-50: #adadad;
+    }
+
+    @media (prefers-color-scheme: light) {
+      :root {
+        --foreground: #000000;
+        --background: #ffffff;
+
+        --accent-50: #525252;
+      }
+    }
+
+    body {
+      display: flex;
+      flex-direction: column;
+      margin: 0;
+      justify-content: center;
+      align-items: center;
+      min-height: 100vh;
+    }
+
+    body {
+      background: var(--background);
+      font-family: "Roboto", sans-serif;
+      color: var(--foreground);
+
+      h1 {
+        margin: 0;
+      }
+
+      h3 {
+        margin: 0;
+        color: var(--accent-50);
+      }
+    }
+  </style>
+</head>
+
+<body>
+  <h1>404</h1>
+  <h3>Page Not Found</h3>
+</body>
+
+</html>
diff --git a/client-handler.fnl b/client-handler.fnl
index dd5aac3..047a809 100644
--- a/client-handler.fnl
+++ b/client-handler.fnl
@@ -32,7 +32,8 @@
              (. _G.files uri) (. _G.files uri)
              (utils.file-exists? uri) (with-open [file (io.open uri :r)]
                                   (file:read :*a))
-             "404 - Not Found"))
+             (with-open [file (io.open :404.html :r)]
+               (file:read :*a))))
 
     (client:send "HTTP/1.1 200 OK\r\n\r\n")
     (client:send content)
