diff --git a/packages/dashboard/app/__tests__/activity-log-mobile-layout.test.ts b/packages/dashboard/app/__tests__/activity-log-mobile-layout.test.ts
index 7390f1e466..73c47dbda0 100644
--- a/packages/dashboard/app/__tests__/activity-log-mobile-layout.test.ts
+++ b/packages/dashboard/app/__tests__/activity-log-mobile-layout.test.ts
@@ -42,12 +42,18 @@ describe("activity-log-mobile-layout.css", () => {
 
   // ── Modal sizing ────────────────────────────────────────────────────
 
-  it("uses modal-lg base class for consistent wide sizing", () => {
-    // The activity-log-modal should NOT set its own max-width; modal-lg handles width
+  it("keeps desktop modal width within the viewport", () => {
     const modalBlock = cssContent.match(/\.activity-log-modal\s*\{[^}]*\}/)?.[0];
     expect(modalBlock).toBeTruthy();
-    // Should NOT contain max-width (handled by modal-lg base class)
-    expect(modalBlock).not.toMatch(/max-width:\s*\d+px/);
+    expect(modalBlock).toContain("width: min(95vw, 640px);");
+    expect(modalBlock).toContain("max-width: 95vw;");
+  });
+
+  it("keeps desktop modal height inside the visible viewport", () => {
+    const modalBlock = cssContent.match(/\.activity-log-modal\s*\{[^}]*\}/)?.[0];
+    expect(modalBlock).toBeTruthy();
+    expect(modalBlock).toMatch(/max-height:\s*calc\(100dvh - var\(--overlay-padding-top,\s*10vh\) - 16px\);/);
+    expect(modalBlock).toContain("overflow: hidden;");
   });
 
   // ── Close button ────────────────────────────────────────────────────
diff --git a/packages/dashboard/app/components/ScriptsModal.css b/packages/dashboard/app/components/ScriptsModal.css
index 33be4d3ecd..5cd5795bab 100644
--- a/packages/dashboard/app/components/ScriptsModal.css
+++ b/packages/dashboard/app/components/ScriptsModal.css
@@ -1180,9 +1180,12 @@
 /* ── Activity Log Modal ─────────────────────────────────────────── */
 
 .activity-log-modal {
-  max-height: 80vh;
+  width: min(95vw, 640px);
+  max-width: 95vw;
+  max-height: calc(100dvh - var(--overlay-padding-top, 10vh) - 16px);
   display: flex;
   flex-direction: column;
+  overflow: hidden;
 }
 
 .activity-log-header {