Limit width of an image

Author: rotorman

docs/fest2026.md

@@ -8,7 +8,7 @@ hide:
 
 <p></p> 
 <p align="center">
-<a><img src="/assets/FestPoster2026_portrait.jpg?raw=true" align="center" height="800"></a>
+<a><img src="/assets/FestPoster2026_portrait.jpg?raw=true" align="center" width="600"></a>
 </P>