diff --git a/index.html b/index.html
index ddb8b6d..11f5218 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,24 @@
     <title>NIST AI Glossary Browser</title>
   </head>
   <body>
-    <div id="root"></div>
+    <main>
+      <div id="root"></div>
+    </main>
+    <footer>
+      The content on this web site is based on Daniel Atherton, Reva Schwartz,
+      Peter C. Fontana, Patrick Hall (2023) The Language of Trustworthy AI: An
+      In-Depth Glossary of Terms. (National Institute of Standards and
+      Technology, Gaithersburg, MD), NIST Artificial Intelligence
+      <a href="https://doi.org/10.6028/NIST.AI.100-3" target="_blank"
+        >AI 100-3</a
+      >, republished courtesy of the National Institute of Standards and
+      Technology.
+      <a
+        href="https://www.nist.gov/open/copyright-fair-use-and-licensing-statements-srd-data-software-and-technical-series-publications#techpubs"
+        >License conditions</a
+      >
+      apply.
+    </footer>
     <script type="module" src="/src/main.tsx"></script>
   </body>
 </html>
diff --git a/src/index.css b/src/index.css
index c7f2f66..5d9316e 100644
--- a/src/index.css
+++ b/src/index.css
@@ -27,17 +27,24 @@ a:hover {
 body {
   margin: 0;
   display: flex;
+  flex-direction: column;
   place-items: center;
   min-width: 320px;
   min-height: 100vh;
 }
 
+footer {
+  padding: 1rem;
+  margin: 0 2rem;
+  font-size: 0.6rem;
+}
+
 #root {
   display: flex;
   flex-direction: column;
   place-items: center;
   width: 100%;
-  padding: 2rem;
+  padding: 2rem 0;
 }
 
 button {
