diff --git a/packages/presentation/src/components/MessageBox.svelte b/packages/presentation/src/components/MessageBox.svelte
index 271d9877fc..5e12f9aaab 100644
--- a/packages/presentation/src/components/MessageBox.svelte
+++ b/packages/presentation/src/components/MessageBox.svelte
@@ -38,6 +38,8 @@
     display: flex;
     flex-direction: column;
     padding: 2rem 1.75rem 1.75rem;
+    width: 30rem;
+    max-width: 40rem;
     background: var(--theme-msgbox-bg);
     border-radius: 1.25rem;
     user-select: none;