style: fit code blocks without scrollbars

Set max-height:none and overflow:visible on pre/code blocks
with a smaller font-size (0.48em) so all code fits on screen.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

index.html

@@ -63,6 +63,19 @@
       margin-bottom: 0.2em;
     }
 
+    /* Code blocks: fit without scrollbars */
+    .reveal pre {
+      width: 100%;
+      max-height: none;
+      overflow: visible;
+    }
+    .reveal pre code {
+      font-size: 0.48em;
+      line-height: 1.45;
+      max-height: none;
+      overflow: visible;
+    }
+
     /* Tool logos — fixed like OVHcloud logo, toggled by JS per slide */
     .tool-logo-global {
       position: fixed;