Fix image to modal (i.e. avoid scrollbars)

sass/_modal.scss

@@ -28,6 +28,13 @@
                     }
                 }
             }
+            .modal-body--image {
+                height: 72vh;
+                .chat-image {
+                    max-height: 99%;
+                    max-width: 100%;
+                }
+            }
             .modal-footer {
                 justify-content: flex-start;
             }

src/templates/image_modal.js

@@ -10,7 +10,7 @@ export default (o) => html`
                 <h4 class="modal-title" id="message-versions-modal-label">${__('Image: ')}<a target="_blank" rel="noopener" href="${o.src}">${o.src}</a></h4>
                 ${modal_header_close_button}
             </div>
-            <div class="modal-body fit-content">
+            <div class="modal-body modal-body--image fit-content">
                 <img class="chat-image" src="${o.src}"/>
             </div>
             <div class="modal-footer">${modal_close_button}</div>