diff --git a/packages/components/package.json b/packages/components/package.json
index aa62c4a3..db9b3160 100644
--- a/packages/components/package.json
+++ b/packages/components/package.json
@@ -3,6 +3,8 @@
   "version": "0.2.20",
   "license": "MIT",
   "dependencies": {
+    "@headlessui/react": "^1.6.4",
+    "@heroicons/react": "^1.0.6",
     "@hookform/resolvers": "^2.8.10",
     "@quri/squiggle-lang": "^0.2.8",
     "@react-hook/size": "^2.1.2",
diff --git a/packages/components/src/components/CodeEditor.tsx b/packages/components/src/components/CodeEditor.tsx
index b052d7e1..473afd93 100644
--- a/packages/components/src/components/CodeEditor.tsx
+++ b/packages/components/src/components/CodeEditor.tsx
@@ -29,6 +29,7 @@ export let CodeEditor: FC<CodeEditorProps> = ({
       mode="golang"
       theme="github"
       width={"100%"}
+      fontSize={14}
       height={String(height) + "px"}
       minLines={oneLine ? lineCount : undefined}
       maxLines={oneLine ? lineCount : undefined}
diff --git a/packages/components/src/components/ErrorBox.tsx b/packages/components/src/components/ErrorBox.tsx
index eb34b9d5..1eaed201 100644
--- a/packages/components/src/components/ErrorBox.tsx
+++ b/packages/components/src/components/ErrorBox.tsx
@@ -1,12 +1,21 @@
 import * as React from "react";
+import { XCircleIcon } from "@heroicons/react/solid";
+
 export const ErrorBox: React.FC<{
   heading: string;
   children: React.ReactNode;
 }> = ({ heading = "Error", children }) => {
   return (
-    <div className="border border-red-200 bg-gray-50 p-4">
-      <h3>{heading}</h3>
-      {children}
+    <div className="rounded-md bg-red-100 p-4 m-4">
+      <div className="flex">
+        <div className="flex-shrink-0">
+          <XCircleIcon className="h-5 w-5 text-red-400" aria-hidden="true" />
+        </div>
+        <div className="ml-3">
+          <h3 className="text-sm font-medium text-red-800">{heading}</h3>
+          <div className="mt-2 text-sm text-red-700">{children}</div>
+        </div>
+      </div>
     </div>
   );
-};
+};
\ No newline at end of file
diff --git a/packages/components/src/components/SquiggleChart.tsx b/packages/components/src/components/SquiggleChart.tsx
index 08586dcc..3b4232ce 100644
--- a/packages/components/src/components/SquiggleChart.tsx
+++ b/packages/components/src/components/SquiggleChart.tsx
@@ -54,7 +54,7 @@ export const VariableBox: React.FC<VariableBoxProps> = ({
     return (
       <div className="bg-white border border-grey-200 m-2">
         <div className="border-b border-grey-200 p-3">
-          <h3>{heading}</h3>
+          <h3 className="font-mono">{heading}</h3>
         </div>
         <div className="p-3">{children}</div>
       </div>
diff --git a/packages/components/src/components/SquigglePlayground.tsx b/packages/components/src/components/SquigglePlayground.tsx
index cf02c96b..a66d33b9 100644
--- a/packages/components/src/components/SquigglePlayground.tsx
+++ b/packages/components/src/components/SquigglePlayground.tsx
@@ -8,6 +8,9 @@ import { useForm, useWatch } from "react-hook-form";
 import * as yup from "yup";
 import { yupResolver } from "@hookform/resolvers/yup";
 import { defaultBindings, environment } from "@quri/squiggle-lang";
+import { Tab } from "@headlessui/react";
+import { CodeIcon } from "@heroicons/react/solid";
+import { CogIcon } from "@heroicons/react/solid";
 
 interface ShowBoxProps {
   height: number;
@@ -15,9 +18,7 @@ interface ShowBoxProps {
 }
 
 const ShowBox: React.FC<ShowBoxProps> = ({ height, children }) => (
-  <div className="border border-grey-100" style={{ height: height + "px" }}>
-    {children}
-  </div>
+  <div className="border border-gray-500">{children}</div>
 );
 
 interface TitleProps {
@@ -26,12 +27,7 @@ interface TitleProps {
 }
 
 const Display: React.FC<TitleProps> = ({ maxHeight, children }) => (
-  <div
-    className="bg-gray-50 border-l border-grey-100 p-2"
-    style={{ maxHeight: maxHeight + "px" }}
-  >
-    {children}
-  </div>
+  <div style={{ maxHeight: maxHeight + "px" }}>{children}</div>
 );
 
 interface PlaygroundProps {
@@ -88,12 +84,70 @@ type InputProps = {
 };
 
 const InputItem: React.FC<InputProps> = ({ label, children }) => (
-  <div>
-    <label>{label}</label>
-    {children}
+  <div className="col-span-3">
+    <label className="block text-sm font-medium text-gray-600">{label}</label>
+    <div className="mt-1">{children}</div>
   </div>
 );
 
+let numberStyle =
+  "max-w-lg block w-full shadow-sm focus:ring-indigo-500 focus:border-indigo-500 sm:max-w-xs sm:text-sm border-gray-300 rounded-md";
+let checkboxStyle =
+  "focus:ring-indigo-500 h-4 w-4 text-indigo-600 border-gray-300 rounded";
+
+const tabs = [
+  { name: "Editor", href: "#", current: true },
+  { name: "Settings", href: "#", current: false },
+];
+
+function classNames(...classes) {
+  return classes.filter(Boolean).join(" ");
+}
+
+function Example() {
+  return (
+    <div>
+      <div className="sm:hidden">
+        <label htmlFor="tabs" className="sr-only">
+          Select a tab
+        </label>
+        {/* Use an "onChange" listener to redirect the user to the selected tab URL. */}
+        <select
+          id="tabs"
+          name="tabs"
+          className="block w-full pl-3 pr-10 py-2 text-base border-gray-300 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 sm:text-sm rounded-md"
+          defaultValue={"Editor"}
+        >
+          {tabs.map((tab) => (
+            <option key={tab.name}>{tab.name}</option>
+          ))}
+        </select>
+      </div>
+      <div className="hidden sm:block">
+        <div className="border-b border-gray-200">
+          <nav className="-mb-px flex space-x-8" aria-label="Tabs">
+            {tabs.map((tab) => (
+              <a
+                key={tab.name}
+                href={tab.href}
+                className={classNames(
+                  tab.current
+                    ? "border-indigo-500 text-indigo-600"
+                    : "border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300",
+                  "whitespace-nowrap py-4 px-1 border-b-2 font-medium text-sm"
+                )}
+                aria-current={tab.current ? "page" : undefined}
+              >
+                {tab.name}
+              </a>
+            ))}
+          </nav>
+        </div>
+      </div>
+    </div>
+  );
+}
+
 let SquigglePlayground: FC<PlaygroundProps> = ({
   initialSquiggleString = "",
   height = 500,
@@ -142,80 +196,186 @@ let SquigglePlayground: FC<PlaygroundProps> = ({
       setImportsAreValid(false);
     }
   };
+
+  let tab = (key, icon) => (
+    <Tab
+      key={key}
+      className={({ selected }) =>
+        classNames(
+          "whitespace-nowrap pb-1 pt-2 px-1 border-b-2 font-medium text-sm focus-within:outline-none group inline-flex items-center",
+          selected
+            ? "border-slate-400 text-gray-500"
+            : "border-transparent text-gray-400 hover:text-gray-600 hover:border-slate-300"
+        )
+      }
+    >
+      {icon}
+      <span>{key}</span>
+    </Tab>
+  );
+
   return (
-    <ShowBox height={height}>
-      <input type="checkbox" {...register("showSettingsPage")} />
-      <div className="columns-2">
-        <div className="break-inside-avoid">
-          {vars.showSettingsPage ? (
-            <>
-              <InputItem label="Sample Count">
-                <input type="number" {...register("sampleCount")} />
-              </InputItem>
-              <InputItem label="XYPointLength Count">
-                <input type="number" {...register("xyPointLength")} />
-              </InputItem>
-              <InputItem label="Chart Height (in Pixels)">
-                <input type="number" {...register("chartHeight")} />
-              </InputItem>
-              <InputItem label="Show Types">
-                <input type="checkbox" {...register("showTypes")} />
-              </InputItem>
-              <InputItem label="Show Controls">
-                <input type="checkbox" {...register("showControls")} />
-              </InputItem>
-              <InputItem label="Show Summary Statistics">
-                <input type="checkbox" {...register("showSummary")} />
-              </InputItem>
-              <InputItem label="Editor Width">
-                <input
-                  type="range"
-                  min="1"
-                  max="100"
-                  className="slider"
-                  {...register("leftSizePercent")}
-                />
-              </InputItem>
-              <InputItem label="Json Editor for imports">
-                <>
-                  <JsonEditor
-                    value={importString}
-                    onChange={getChangeJson}
-                    oneLine={false}
-                    showGutter={true}
-                    height={100}
+    <div className="border border-slate-300 rounded-sm">
+      <Tab.Group>
+        <div className="bg-slate-200 rounded-tl-sm rounded-tr-sm">
+          <div className="pb-3 pl-3">
+            <div className="border-b border-gray-200">
+              <Tab.List className="-mb-px flex space-x-4">
+                {tab(
+                  "Code",
+                  <CodeIcon
+                    className="text-gray-400 group-hover:text-gray-500 -ml-0.5 mr-2 h-4 w-4"
+                    aria-hidden="true"
                   />
-                  {importsAreValid ? "Valid" : "Invalid"}
+                )}
+                {tab(
+                  "Settings",
+                  <CogIcon
+                    className="text-gray-400 group-hover:text-gray-500 -ml-0.5 mr-2 h-4 w-4"
+                    aria-hidden="true"
+                  />
+                )}
+              </Tab.List>
+            </div>
+          </div>
+        </div>
+        <div className="flex" style={{ height: height + "px" }}>
+          <div className="w-1/2">
+            <Tab.Panels>
+              <Tab.Panel>
+                <CodeEditor
+                  value={squiggleString}
+                  onChange={setSquiggleString}
+                  oneLine={false}
+                  showGutter={true}
+                  height={height - 1}
+                />
+              </Tab.Panel>
+              <Tab.Panel>
+                <>
+                  <form className="space-y-6 p-3">
+                    <InputItem label="Sample Count">
+                      <>
+                        <input
+                          type="number"
+                          {...register("sampleCount")}
+                          className={numberStyle}
+                        />
+                        <p className="mt-2 text-sm text-gray-500">
+                          How many samples to use for Monte Carlo simulations.
+                          This can be overridden by specific programs.
+                        </p>
+                      </>
+                    </InputItem>
+                    <InputItem label="Coordinate Count (For PointSet Shapes)">
+                      <>
+                        <input
+                          type="number"
+                          {...register("xyPointLength")}
+                          className={numberStyle}
+                        />
+                        <p className="mt-2 text-sm text-gray-500">
+                          When distributions are converted into PointSet shapes,
+                          we need to know how many coordinates to use.
+                        </p>
+                      </>
+                    </InputItem>
+                    <InputItem label="Chart Height (in Pixels)">
+                      <input
+                        type="number"
+                        {...register("chartHeight")}
+                        className={numberStyle}
+                      />
+                    </InputItem>
+                    <InputItem label="Editor Width">
+                      <input
+                        type="range"
+                        min="1"
+                        max="100"
+                        className="slider"
+                        {...register("leftSizePercent")}
+                      />
+                    </InputItem>
+                    <fieldset className="space-y-2">
+                      <div className="relative flex items-start">
+                        <div className="flex items-center h-5">
+                          <input
+                            type="checkbox"
+                            {...register("showTypes")}
+                            className="focus:ring-indigo-500 h-4 w-4 text-indigo-600 border-gray-300 rounded"
+                          />
+                        </div>
+                        <div className="ml-3 text-sm">
+                          <label className="font-medium text-gray-700">
+                            Type Names
+                          </label>
+                        </div>
+                      </div>
+                      <div className="relative flex items-start">
+                        <div className="flex items-center h-5">
+                          <input
+                            type="checkbox"
+                            {...register("showControls")}
+                            className="focus:ring-indigo-500 h-4 w-4 text-indigo-600 border-gray-300 rounded"
+                          />
+                        </div>
+                        <div className="ml-3 text-sm">
+                          <label className="font-medium text-gray-700">
+                            X-Y Coordinate Scales
+                          </label>
+                        </div>
+                      </div>
+                      <div className="relative flex items-start">
+                        <div className="flex items-center h-5">
+                          <input
+                            type="checkbox"
+                            {...register("showSummary")}
+                            className="focus:ring-indigo-500 h-4 w-4 text-indigo-600 border-gray-300 rounded"
+                          />
+                        </div>
+                        <div className="ml-3 text-sm">
+                          <label className="font-medium text-gray-700">
+                            Summary Statistics
+                          </label>
+                        </div>
+                      </div>
+                    </fieldset>
+                    <InputItem label="Json Editor for imports">
+                      <>
+                        <JsonEditor
+                          value={importString}
+                          onChange={getChangeJson}
+                          oneLine={false}
+                          showGutter={true}
+                          height={100}
+                        />
+                        {importsAreValid ? "Valid" : "Invalid"}
+                      </>
+                    </InputItem>
+                  </form>
                 </>
-              </InputItem>
-            </>
-          ) : (
-            <CodeEditor
-              value={squiggleString}
-              onChange={setSquiggleString}
-              oneLine={false}
-              showGutter={true}
-              height={height - 3}
-            />
-          )}
+              </Tab.Panel>
+            </Tab.Panels>
+          </div>
+
+          <div className="w-1/2 border-l border-gray-300 p-2">
+            <div style={{ maxHeight: height + "px" }}>
+              <SquiggleChart
+                squiggleString={squiggleString}
+                environment={env}
+                chartSettings={chartSettings}
+                height={vars.chartHeight}
+                showTypes={vars.showTypes}
+                showControls={vars.showControls}
+                bindings={defaultBindings}
+                jsImports={imports}
+                showSummary={vars.showSummary}
+              />
+            </div>
+          </div>
         </div>
-        <div>
-          <Display maxHeight={height - 3}>
-            <SquiggleChart
-              squiggleString={squiggleString}
-              environment={env}
-              chartSettings={chartSettings}
-              height={vars.chartHeight}
-              showTypes={vars.showTypes}
-              showControls={vars.showControls}
-              bindings={defaultBindings}
-              jsImports={imports}
-              showSummary={vars.showSummary}
-            />
-          </Display>
-        </div>
-      </div>
-    </ShowBox>
+      </Tab.Group>
+    </div>
   );
 };
 export default SquigglePlayground;
diff --git a/yarn.lock b/yarn.lock
index 282fcbaf..af03d222 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1824,6 +1824,16 @@
   dependencies:
     "@hapi/hoek" "^9.0.0"
 
+"@headlessui/react@^1.6.4":
+  version "1.6.4"
+  resolved "https://registry.yarnpkg.com/@headlessui/react/-/react-1.6.4.tgz#c73084e23386bef5fb86cd16da3352c3a844bb4c"
+  integrity sha512-0yqz1scwbFtwljmbbKjXsSGl5ABEYNICVHZnMCWo0UtOZodo2Tpu94uOVgCRjRZ77l2WcTi2S0uidINDvG7lsA==
+
+"@heroicons/react@^1.0.6":
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/@heroicons/react/-/react-1.0.6.tgz#35dd26987228b39ef2316db3b1245c42eb19e324"
+  integrity sha512-JJCXydOFWMDpCP4q13iEplA503MQO3xLoZiKum+955ZCtHINWnx26CUxVxxFQu/uLb4LW3ge15ZpzIkXKkJ8oQ==
+
 "@hookform/resolvers@^2.8.10":
   version "2.8.10"
   resolved "https://registry.yarnpkg.com/@hookform/resolvers/-/resolvers-2.8.10.tgz#b66d7a7848b1b1dd5b976a73fff36bb366666e7d"