diff --git a/src/index.css b/src/index.css
index 149375a8..52e7a829 100644
--- a/src/index.css
+++ b/src/index.css
@@ -8,7 +8,7 @@
   --sai-left: env(safe-area-inset-left);
 
   --text-size: 16px;
-  --main-width: 40em;
+  --main-width: max(60dvw, 40em);
   text-size-adjust: none;
   --hairline-width: 1px;
   --monospace-font: ui-monospace, 'SFMono-Regular', Consolas, 'Liberation Mono',