diff --git a/src/components/dots.js b/src/components/dots.js
index 94acdf2..6af7a83 100644
--- a/src/components/dots.js
+++ b/src/components/dots.js
@@ -1,10 +1,10 @@
 // calculate tiles
 
-export function dots(m, n, max) {
-	const ps = [];
+export function make_dots(m, n, cell, max) {
 	if( m - n === 0 ) {
-		return ps;
+		return [];
 	}
+	const ps = [];
 	const imin = -max;
 	const imax = max / m;
 	for( let i = imin; i <= imax; i++ ) {
diff --git a/src/index.md b/src/index.md
index bf3b72b..a3a984e 100644
--- a/src/index.md
+++ b/src/index.md
@@ -2,70 +2,82 @@
 toc: false
 ---
 
-<div class="hero">
-  <h1>poptimal</h1>
-  <h2>Welcome to your new app! Edit&nbsp;<code style="font-size: 90%;">src/index.md</code> to change this page.</h2>
-  <a href="https://observablehq.com/framework/getting-started">Get started<span style="display: inline-block; margin-left: 0.25rem;">↗︎</span></a>
-</div>
+<h1>poptimal</h1>
 
-<div class="grid grid-cols-2" style="grid-auto-rows: 504px;">
-  <div class="card">${
-    resize((width) => Plot.plot({
-      title: "Your awesomeness over time 🚀",
-      subtitle: "Up and to the right!",
-      width,
-      y: {grid: true, label: "Awesomeness"},
-      marks: [
-        Plot.ruleY([0]),
-        Plot.lineY(aapl, {x: "Date", y: "Close", tip: true})
-      ]
-    }))
-  }</div>
-  <div class="card">${
-    resize((width) => Plot.plot({
-      title: "How big are penguins, anyway? 🐧",
-      width,
-      grid: true,
-      x: {label: "Body mass (g)"},
-      y: {label: "Flipper length (mm)"},
-      color: {legend: true},
-      marks: [
-        Plot.linearRegressionY(penguins, {x: "body_mass_g", y: "flipper_length_mm", stroke: "species"}),
-        Plot.dot(penguins, {x: "body_mass_g", y: "flipper_length_mm", stroke: "species", tip: true})
-      ]
-    }))
-  }</div>
-</div>
+```js
 
----
+import {make_dots} from './components/dots.js'
 
-## Next steps
+const CELL = 10;
+const WIDTH = 20;
+const HEIGHT = 20;
 
-Here are some ideas of things you could try…
+const bg = view(Inputs.color({label: "background", value: d3.color("yellow").formatHex()}))
+const fg1 = view(Inputs.color({label: "fg1", value: d3.color("red").formatHex()}))
+const m1 = view(Inputs.range([1, 5], {value: 2, step: 1, label:"m1"}));
+const n1 = view(Inputs.range([1, 5], {value: 2, step: 1, label:"n1"}));
+
+
+const fg2 = view(Inputs.color({label: "fg2", value: d3.color("blue").formatHex()}))
+
+const m2 = view(Inputs.range([1, 5], {value: 2, step: 1, label:"m2"}));
+const n2 = view(Inputs.range([1, 5], {value: 2, step: 1, label:"n2"}));
+
+
+```
+
+```js
+
+const dots1 = make_dots(1 / m1, n1, CELL, WIDTH)
+const dots2 = make_dots(1 / m2, n2, CELL, WIDTH)
+
+```
+  
+```js
+
+
+const svg = d3.create("svg")
+  .attr("width", WIDTH * CELL * 2)
+  .attr("height", HEIGHT * CELL * 2)
+  .attr("viewBox", [ 0, 0, WIDTH, HEIGHT ])
+  .attr("style", "max-width: 100%; height: auto;");
+
+const background = svg.append("rect")
+  .attr("x", 0)
+  .attr("y", 0)
+  .attr("width", WIDTH * 20)
+  .attr("height", WIDTH * 20)
+  .attr("fill", bg);
+
+const dots_g1 = svg.append("g")
+  .attr("id", "dots1");
+
+dots_g1.selectAll("circle")
+  .data(dots1)
+  .join("circle")
+  .attr("r", 0.2)
+  .attr("fill", fg1)
+  .attr("cx", (d) => d.x)
+  .attr("cy", (d) => d.y);
+
+const dots_g2 = svg.append("g")
+  .attr("id", "dots2");
+
+dots_g2.selectAll("circle")
+  .data(dots2)
+  .join("circle")
+  .attr("r", 0.2)
+  .attr("fill", fg2)
+  .attr("cx", (d) => d.x)
+  .attr("cy", (d) => d.y);
+
+
+
+display(svg.node());
+
+
+```
 
-<div class="grid grid-cols-4">
-  <div class="card">
-    Chart your own data using <a href="https://observablehq.com/framework/lib/plot"><code>Plot</code></a> and <a href="https://observablehq.com/framework/files"><code>FileAttachment</code></a>. Make it responsive using <a href="https://observablehq.com/framework/javascript#resize(render)"><code>resize</code></a>.
-  </div>
-  <div class="card">
-    Create a <a href="https://observablehq.com/framework/project-structure">new page</a> by adding a Markdown file (<code>whatever.md</code>) to the <code>src</code> folder.
-  </div>
-  <div class="card">
-    Add a drop-down menu using <a href="https://observablehq.com/framework/inputs/select"><code>Inputs.select</code></a> and use it to filter the data shown in a chart.
-  </div>
-  <div class="card">
-    Write a <a href="https://observablehq.com/framework/loaders">data loader</a> that queries a local database or API, generating a data snapshot on build.
-  </div>
-  <div class="card">
-    Import a <a href="https://observablehq.com/framework/imports">recommended library</a> from npm, such as <a href="https://observablehq.com/framework/lib/leaflet">Leaflet</a>, <a href="https://observablehq.com/framework/lib/dot">GraphViz</a>, <a href="https://observablehq.com/framework/lib/tex">TeX</a>, or <a href="https://observablehq.com/framework/lib/duckdb">DuckDB</a>.
-  </div>
-  <div class="card">
-    Ask for help, or share your work or ideas, on our <a href="https://github.com/observablehq/framework/discussions">GitHub discussions</a>.
-  </div>
-  <div class="card">
-    Visit <a href="https://github.com/observablehq/framework">Framework on GitHub</a> and give us a star. Or file an issue if you’ve found a bug!
-  </div>
-</div>
 
 <style>