diff --git a/app/assets/stylesheets/qr-codes.css b/app/assets/stylesheets/qr-codes.css
index 99d294ec7..91aebcd64 100644
--- a/app/assets/stylesheets/qr-codes.css
+++ b/app/assets/stylesheets/qr-codes.css
@@ -2,7 +2,7 @@
   .qr-code {
     aspect-ratio: 1;
     border-radius: 1ch;
-    inline-size: 50dvh;
+    inline-size: clamp(20ch, 50dvh, 70ch);
     margin-block: var(--block-space);
   }
 }