diff --git a/docs/extra.css b/docs/extra.css
new file mode 100644
index 0000000..0e74960
--- /dev/null
+++ b/docs/extra.css
@@ -0,0 +1,24 @@
+.ascii-wrapper {
+    width: 100%;
+    display: flex;
+    justify-content: center;
+    overflow-x: auto;
+    -webkit-overflow-scrolling: touch;
+    padding: 1rem 0;
+}
+
+.ascii-wrapper pre {
+    width: 100%;
+    font-size: clamp(0.4rem, 1.5cqw, 0.75rem);
+    line-height: 1.2;
+    margin: 0;
+    white-space: pre;
+}
+
+.page-meta {
+    font-size: 0.8em;
+    color: #888;
+    margin-top: 2em;
+    border-top: 1px solid #ccc;
+    padding-top: 0.5em;
+}