Added materials tab

styles.css

@@ -127,6 +127,11 @@ nav a:hover { color: var(--accent); text-decoration: none; }
   font-weight: 500;
 }
 
+.card-downloads {
+  margin: 0.75rem 0 0;
+  line-height: 1.9;
+}
+
 .more-link {
   margin-top: 2rem;
   color: var(--text-dim);