diff --git a/client/src/components/HeaderAdBanner.vue b/client/src/components/HeaderAdBanner.vue
index a777d28..ea459a8 100644
--- a/client/src/components/HeaderAdBanner.vue
+++ b/client/src/components/HeaderAdBanner.vue
@@ -201,8 +201,30 @@ async function renderPropeller() {
                     }
                     const moved = placeholder.firstElementChild;
                     if (moved) {
+                      // Normalize size
                       moved.style.maxWidth = '100%';
                       moved.style.display = 'block';
+                      // If provider inserted a fixed/absolute positioned element (overlays),
+                      // force it to behave as inline block inside our header placeholder.
+                      try {
+                        const cs = getComputedStyle(moved);
+                        if (cs.position === 'fixed' || cs.position === 'absolute') {
+                          moved.style.setProperty('position', 'relative', 'important');
+                          moved.style.setProperty('top', 'auto', 'important');
+                          moved.style.setProperty('right', 'auto', 'important');
+                          moved.style.setProperty('left', 'auto', 'important');
+                          moved.style.setProperty('bottom', 'auto', 'important');
+                          moved.style.setProperty('z-index', '1', 'important');
+                          moved.style.setProperty('width', '100%', 'important');
+                          moved.style.setProperty('max-width', '970px', 'important');
+                        }
+                        if (moved.tagName === 'IFRAME') {
+                          moved.style.width = '100%';
+                          moved.style.height = moved.style.height || '60px';
+                        }
+                      } catch (e) {
+                        console.warn('style normalize failed', e);
+                      }
                     }
                     observer.disconnect();
                     try { window.dispatchEvent(new CustomEvent('ads:relocated',{detail:{provider:'propeller',zone:propSlotId}})); } catch {}