diff --git a/allure-commandline/custom-iframe-resize.js b/allure-commandline/custom-iframe-resize.js
new file mode 100644
index 000000000..bfdf60df8
--- /dev/null
+++ b/allure-commandline/custom-iframe-resize.js
@@ -0,0 +1,76 @@
+;(function () {
+  'use strict';
+  // Iframe resizer
+  function measureIframe(iframe) {
+    try {
+      var doc = iframe.contentDocument || (iframe.contentWindow && iframe.contentWindow.document);
+      if (!doc) return;
+      var body = doc.body, html = doc.documentElement;
+      var h = Math.max(
+        (body && body.scrollHeight) || 0,
+        (html && html.scrollHeight) || 0,
+        (body && body.offsetHeight) || 0,
+        (html && html.offsetHeight) || 0
+      );
+      iframe.style.width = '100%';
+      var fh = Math.max(h || 0, 20);
+      if (iframe.style.height !== fh + 'px') iframe.style.height = fh + 'px';
+    } catch (e) {
+      // ignore cross-origin access errors
+    }
+  }
+
+  function measureAll() {
+    try {
+      var all = document.querySelectorAll('.attachment__iframe');
+      for (var i = 0; i < all.length; i++) {
+        measureIframe(all[i]);
+      }
+    } catch (e) {}
+  }
+
+  function attachListeners() {
+    try {
+      var iframes = document.querySelectorAll('.attachment__iframe');
+      for (var i = 0; i < iframes.length; i++) {
+        var f = iframes[i];
+        if (f.dataset._resizerAttached) continue;
+        f.dataset._resizerAttached = '1';
+        try {
+          f.addEventListener('load', function (ev) {
+            measureIframe(ev.currentTarget);
+            // transient polling in case the iframe applies late layout
+            var tries = 0, max = 6;
+            var iv = setInterval(function () { try { measureIframe(ev.currentTarget); } catch (e) {} tries++; if (tries >= max) clearInterval(iv); }, 400);
+          });
+        } catch (e) {}
+      }
+    } catch (e) {}
+  }
+
+  function observeDom() {
+    try {
+      if (document.body) {
+        var mo = new MutationObserver(function (entries) {
+          entries.forEach(function (en) {
+            try {
+              if (en.addedNodes && en.addedNodes.length) {
+                attachListeners();
+                measureAll();
+              }
+            } catch (e) {}
+          });
+        });
+        mo.observe(document.body, { childList: true, subtree: true });
+      }
+    } catch (e) {}
+  }
+
+  // initial wiring
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', function () { attachListeners(); observeDom(); measureAll(); });
+  } else {
+    attachListeners(); observeDom(); measureAll();
+  }
+
+})();
diff --git a/allure-commandline/custom-styles.css b/allure-commandline/custom-styles.css
new file mode 100644
index 000000000..0c738a41d
--- /dev/null
+++ b/allure-commandline/custom-styles.css
@@ -0,0 +1,68 @@
+.attachment__iframe {
+  /* Allow JS to set an explicit pixel height based on the attachment HTML content.*/
+  width: 100% !important;
+  border: none !important;
+  height: auto; /* inline height set by JS will apply */
+}
+
+.attachment__iframe_fullscreen {
+  height: 85vh !important;
+}
+
+.attachment__iframe-container {
+  overflow: visible !important;
+  padding: 0 !important;
+  margin: 0 !important;
+}
+
+/* Make the attachment panel use full available width and remove inner gutters */
+.test-result__content, .testcase__content, .details-content {
+  padding: 0 !important;
+}
+
+/* Presentation mode: only when body.presentation-mode is present */
+body.presentation-mode .side-nav,
+body.presentation-mode .app__header,
+body.presentation-mode .app__nav,
+body.presentation-mode .side-nav__head,
+body.presentation-mode .side-nav__menu {
+  display: none !important;
+  visibility: hidden !important;
+  width: 0 !important;
+  height: 0 !important;
+  padding: 0 !important;
+  margin: 0 !important;
+}
+
+body.presentation-mode .app { display: block !important; }
+body.presentation-mode .app__content { margin-left: 0 !important; width: 100% !important; }
+
+/* Make the attachment iframe expand to fill the right-hand content panel (not fullscreen).
+   The JS will set an explicit height based on the attachment's HTML content*/
+body.presentation-mode .attachment__iframe {
+  position: relative !important;
+  display: block !important;
+  width: 100% !important;
+  height: auto !important; /* explicit px height will be applied by JS */
+  max-height: calc(100vh - 120px) !important; /* leave space for header/toolbars */
+  z-index: 999 !important;
+  border: none !important;
+  background: #fff !important;
+}
+
+/* Hide other panels that might overlay the iframe */
+body.presentation-mode .popup, body.presentation-mode #popup, body.presentation-mode .modal__background, body.presentation-mode .modal__window { display: none !important; }
+
+/* Small injected button to manually expand/collapse HTML attachments in the panel */
+.copilot-expand-btn {
+  margin-left: 6px;
+  padding: 4px 8px;
+  font-size: 12px;
+  border-radius: 3px;
+  background: #2b6cb0;
+  color: #fff;
+  border: none;
+  cursor: pointer;
+}
+.copilot-expand-btn:hover { background: #2c5282; }
+