diff --git a/README.md b/README.md
index 7b2a710..4f951b9 100644
--- a/README.md
+++ b/README.md
@@ -10,3 +10,10 @@ remote renderers, notebooks, etc.
 This repository contains the specification and a reference implementation in JavaScript.
 
 Read the spec at https://pygfx.org/renderview/
+
+
+## Contributing
+
+The JS code is formatted and linted with `standardjs`, which can be installed using `npm install --global standard`.
+
+To lint/format, run `standard src --fix` in the root of the repo before committing.
diff --git a/src/renderview.css b/src/renderview.css
index d2f5443..de27d62 100644
--- a/src/renderview.css
+++ b/src/renderview.css
@@ -15,21 +15,21 @@ div.renderview-wrapper {
     min-height: 32px;
 }
 
-div.renderview-wrapper img,
-div.renderview-wrapper canvas {
+div.renderview-wrapper .renderview-view {
     display: block;
     box-sizing: border-box;
     width: 100%;
     height: 100%;
+    background: none;
     border-radius: 6px;
-    background: #777;
+    border: 1px solid rgba(127, 127, 127, 0.2);
 }
 
-div.renderview-wrapper div.renderview-hidden {
+div.renderview-wrapper .renderview-hidden {
     display: none;
 }
 
-div.renderview-wrapper div.renderview-top {
+div.renderview-wrapper .renderview-top {
     display: none;
     position: absolute;
     box-sizing: border-box;
@@ -38,10 +38,11 @@ div.renderview-wrapper div.renderview-top {
     height: 1.5em;
     width: 100%;
     border-radius: 6px 6px 0 0;
-    box-shadow: 0px -2px 0px 0px rgba(128, 128, 128, 0.5);
+    border: 1px solid rgba(127, 127, 127, 0.2);
+    border-bottom: 0;
 }
 
-div.renderview-wrapper div.renderview-top span {
+div.renderview-wrapper .renderview-top span {
     display: inline-block;
     box-sizing: border-box;
     overflow: hidden;
@@ -51,7 +52,7 @@ div.renderview-wrapper div.renderview-top span {
     width: 100%;
 }
 
-div.renderview-wrapper div.renderview-resizer {
+div.renderview-wrapper .renderview-resizer {
     display: none;
     position: absolute;
     box-sizing: border-box;
@@ -67,16 +68,15 @@ div.renderview-wrapper.has-titlebar {
     margin-top: 2em !important;
 }
 
-div.renderview-wrapper.has-titlebar div.renderview-top {
+div.renderview-wrapper.has-titlebar .renderview-top {
     display: block;
 }
 
-div.renderview-wrapper.has-titlebar img,
-div.renderview-wrapper.has-titlebar canvas {
+div.renderview-wrapper.has-titlebar .renderview-view {
     border-top-left-radius: 0 !important;
     border-top-right-radius: 0 !important;
 }
 
-div.renderview-wrapper.is-resizable div.renderview-resizer {
+div.renderview-wrapper.is-resizable .renderview-resizer {
     display: block;
 }
\ No newline at end of file
diff --git a/src/renderview.js b/src/renderview.js
index ee21f26..598c594 100644
--- a/src/renderview.js
+++ b/src/renderview.js
@@ -328,6 +328,8 @@ class BaseRenderView {
     const wrapperElement = this.wrapperElement
 
     if (wrapperElement !== null) {
+      this.viewElement.classList.add('renderview-view')
+
       // Wrap it
       wrapperElement.classList.add('renderview-wrapper')
       wrapperElement.appendChild(this.viewElement)
diff --git a/src/tester.html b/src/tester.html
index 4feaa22..8950607 100644
--- a/src/tester.html
+++ b/src/tester.html
@@ -41,6 +41,7 @@
                 if (event.type == 'resize') {
                     this.viewElement.width = event.pwidth
                     this.viewElement.height = event.pheight
+                    this.draw()
                 }
                 if (!this._drawRequested) {
                     this._drawRequested = true