diff --git a/frontend/src/ContactPanel.vue b/frontend/src/ContactPanel.vue
index 7bcb020..927eca3 100644
--- a/frontend/src/ContactPanel.vue
+++ b/frontend/src/ContactPanel.vue
@@ -3,7 +3,7 @@
 // socket (via the bridge pagerite.js hands to contact-main), with the
 // composer shared with the admin inbox. state is contact-main's reactive
 // store ({open, thread, unread}).
-import { computed, nextTick, reactive, ref, watch } from 'vue'
+import { computed, nextTick, onMounted, onUnmounted, reactive, ref, watch } from 'vue'
 import { formatWhen } from './analytics/format.js'
 import Composer from './Composer.vue'
 
@@ -26,6 +26,13 @@ watch(() => props.state.open, (open) => { if (open) scrollDown() })
 // Relative timestamps like in analytics.
 const fmtTime = (t) => formatWhen(t)
 
+// Escape closes, like the paskia dialogs whose backdrop we share.
+function onKey(ev) {
+  if (ev.key === 'Escape' && props.state.open) emit('close')
+}
+onMounted(() => addEventListener('keydown', onKey))
+onUnmounted(() => removeEventListener('keydown', onKey))
+
 const NAME_KEY = 'pagerite-contact-name'
 const EMAIL_KEY = 'pagerite-contact-email'
 
@@ -53,7 +60,7 @@ function onSend(md) {
 </script>
 
 <template>
-  <div v-if="state.open" class="contact-backdrop" @click.self="emit('close')">
+  <div v-if="state.open" class="contact-overlay" @click.self="emit('close')">
     <section class="contact-panel" role="dialog" aria-label="Contact us">
       <header>
         <h2>Contact us</h2>
@@ -89,27 +96,43 @@ function onSend(md) {
 </template>
 
 <style scoped>
-.contact-backdrop {
+.contact-overlay {
   position: fixed;
   inset: 0;
-  z-index: 30;
-  background: rgb(0 0 0 / 0.25);
+  /* Above paskia's shared blur backdrop (1099, held by contact-main while
+     open), below the authentication iframe (9999). Transparent: the blur
+     is the backdrop's job, this layer only centers the panel and catches
+     outside clicks (the backdrop itself is pointer-events: none). */
+  z-index: 1100;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 
 .contact-panel {
-  position: absolute;
-  top: 0;
-  right: 0;
-  bottom: 0;
   display: flex;
   flex-direction: column;
-  width: min(26rem, 94vw);
+  /* Same dimensions as paskia's own dialog. */
+  width: min(36rem, 100%);
+  height: min(42rem, 92vh);
   padding: 0.8rem;
   gap: 0.6rem;
   background: var(--bg, Canvas);
   color: var(--text, CanvasText);
-  border-left: 1px solid var(--line);
-  box-shadow: -0.5rem 0 2rem rgb(0 0 0 / 0.2);
+  border: 1px solid var(--line);
+  border-radius: 0.5rem;
+  box-shadow: 0 0.5rem 2rem rgb(0 0 0 / 0.3);
+}
+
+/* Mobile: full screen. */
+@media (max-width: 36rem) {
+  .contact-panel {
+    width: 100%;
+    height: 100%;
+    border: none;
+    border-radius: 0;
+    box-shadow: none;
+  }
 }
 
 .contact-panel header {
diff --git a/frontend/src/contact-main.js b/frontend/src/contact-main.js
index 13f9f71..9dc5753 100644
--- a/frontend/src/contact-main.js
+++ b/frontend/src/contact-main.js
@@ -3,7 +3,8 @@
 // socket through the bridge pagerite.js hands over ({send, register}) —
 // no extra connection is opened. The session token is a localStorage
 // random; the server stores only its hash.
-import { createApp, reactive } from 'vue'
+import { createApp, reactive, watch } from 'vue'
+import { holdGlobalBackdrop, releaseGlobalBackdrop } from 'paskia'
 import ContactPanel from './ContactPanel.vue'
 
 const TOKEN_KEY = 'pagerite-contact-token'
@@ -12,6 +13,14 @@ const SEEN_KEY = 'pagerite-contact-seen'
 let app = null
 const state = reactive({ open: false, thread: null, unread: false })
 
+// The panel is main content, not a sidebar: while open it holds paskia's
+// shared blur backdrop (refcounted, z-index 1099; the panel itself sits at
+// 1100, below the auth iframe's 9999).
+watch(() => state.open, (open) => {
+  if (open) holdGlobalBackdrop()
+  else releaseGlobalBackdrop()
+})
+
 function ensureToken() {
   let token = localStorage.getItem(TOKEN_KEY)
   if (!token) {