web/app.css

@@ -540,6 +540,16 @@ body.busy .prompt {
   font-weight: 700;
 }
 
+.confirm-actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--space-2);
+}
+
+.confirm-actions button {
+  flex: 1 1 auto;
+}
+
 /* --------------------------------------------------------------- Aide */
 
 .help {

web/index.html

@@ -52,7 +52,7 @@
   <!-- Confirmation avant de doubler (ouverte par app/ui/app.js). -->
   <dialog id="double-dialog" class="confirm" aria-labelledby="double-question">
     <p id="double-question"></p>
-    <div class="actions">
+    <div class="confirm-actions">
       <button id="double-confirm" type="button"></button>
       <button id="double-cancel" type="button" class="secondary"></button>
     </div>