small style tweaks and copyright

_includes/footer.njk

@@ -1,3 +1,4 @@
 <footer>
+  <p>© 2026</p>
   <p><a href="/attribution/">site attribution</a></p>
 </footer>

css/main.css

@@ -99,6 +99,7 @@ h1, h2, h3, h4, h5, h6 {
   font-variant: small-caps;
   font-family: Montserrat;
   font-weight: 400;
+  letter-spacing: 5%;
 }
 
 h1 {
@@ -171,10 +172,12 @@ header a:focus-visible .logo {
 footer {
 	background-color: var(--color-accent);
 	color: var(--color-bg);
+	padding: 1rem;
 }
 
 footer p {
 	text-align: center;
+	margin: 0;
 }
 
 footer a,