Update.

src/snek/system/template.py

@@ -131,7 +131,7 @@ def enrich_image_rendering(text):
     soup = BeautifulSoup(text, "html.parser")
     for element in soup.find_all("img"):
         if element.attrs["src"].startswith("/"   ):
-            element.attrs["src"] += "?width=420"
+            element.attrs["src"] += "?width=240"
             picture_template = f'''
                                 <picture>
                                     <source srcset="{element.attrs["src"]}" type="{mimetypes.guess_type(element.attrs["src"])[0]}" />

src/snek/templates/web.html

@@ -331,7 +331,11 @@
       overlay.style.zIndex = 9999;
 
       const fullImg = document.createElement('img');
-      fullImg.src = img.src;
+
+      const urlObj = new URL(img.src);
+      urlObj.search = ''
+        fullImg.src = urlObj.toString();
+
       fullImg.alt = img.alt;
       fullImg.style.maxWidth = '90%';
       fullImg.style.maxHeight = '90%';