diff --git a/package.json b/package.json
index 6793072..84a679d 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "@iconify/svelte": "^3.1.0",
-    "@sveltejs/kit": "1.11.0",
+    "@sveltejs/kit": "1.12.0",
     "d3-array": "^3.2.2",
     "d3-color": "^3.1.0",
     "d3-interpolate-path": "^2.3.0",
@@ -61,8 +61,8 @@
     "remark-math": "3.0.0",
     "sharp": "^0.31.3",
     "svelte-check": "^3.1.4",
-    "svelte-preprocess": "^5.0.2",
-    "svelte-toc": "^0.5.3",
+    "svelte-preprocess": "^5.0.3",
+    "svelte-toc": "^0.5.4",
     "svelte-zoo": "^0.4.3",
     "svelte2tsx": "^0.6.10",
     "typescript": "5.0.2",
diff --git a/src/lib/ColorBar.svelte b/src/lib/ColorBar.svelte
index 9937a19..828b3a7 100644
--- a/src/lib/ColorBar.svelte
+++ b/src/lib/ColorBar.svelte
@@ -1,18 +1,43 @@
 <script lang="ts">
+  import { pretty_num } from '$lib/labels'
   import * as d3sc from 'd3-scale-chromatic'
 
-  export let text: string = ``
-  export let color_scale: ((x: number) => string) | null = null
+  export let text: string | null = null
+  export let color_scale: ((x: number) => string) | string | null = null
   export let text_side: 'left' | 'right' | 'top' | 'bottom' = `left`
   export let style: string | null = null
   export let text_style: string | null = null
   export let wrapper_style: string | null = null
+  export let tick_labels: (string | number)[] | number = 0
+  export let range: [number, number] = []
+  export let tick_side: 'top' | 'bottom' | 'center' = `bottom`
+  // TODO vertical not fully implemented yet
+  export let orientation: 'horizontal' | 'vertical' = `horizontal`
 
-  $: if (color_scale === null) {
-    color_scale = d3sc[`interpolate${text}`]
-    if (color_scale === undefined) console.error(`Color scale not found: ${text}`)
+  $: if (
+    tick_labels?.length == 0 ||
+    typeof tick_labels == `number` ||
+    range?.length > 0
+  ) {
+    const n_ticks = Array.isArray(tick_labels) ? 5 : tick_labels
+    tick_labels = [...Array(n_ticks).keys()].map((idx) => {
+      const x = idx / (n_ticks - 1)
+      return range[0] + x * (range[1] - range[0])
+    })
   }
 
+  $: if (color_scale === null || typeof color_scale == `string`) {
+    color_scale = d3sc[`interpolate${color_scale ?? text}`]
+    if (color_scale === undefined) {
+      console.error(`Color scale '${color_scale ?? text}' not found`)
+    }
+  }
+
+  $: grad_dir = {
+    horizontal: `to right`,
+    vertical: `to bottom`,
+  }[orientation]
+
   $: ramped = [...Array(10).keys()].map((idx) => color_scale?.(idx / 10))
   $: flex_dir = {
     left: `row`,
@@ -20,22 +45,46 @@
     top: `column`,
     bottom: `column-reverse`,
   }[text_side]
+  $: tick_pos = {
+    bottom: `top: 100%`,
+    top: `bottom: 100%`,
+    center: `top: 50%; transform: translateY(-50%)`,
+  }[tick_side]
 </script>
 
-<div style:flex-direction={flex_dir} style={wrapper_style}>
+<div style:flex-direction={flex_dir} style={wrapper_style} class="colorbar">
   {#if text}<span style={text_style}>{text}</span>{/if}
-  <div style:background="linear-gradient(to right, {ramped})" {style} />
+  <div style:background="linear-gradient({grad_dir}, {ramped})" {style}>
+    {#each tick_labels || [] as tick_label, idx}
+      <span style="left: calc(100% * {idx} / {tick_labels?.length - 1}); {tick_pos}">
+        {pretty_num(tick_label, 1)}
+      </span>
+    {/each}
+  </div>
 </div>
 
 <style>
-  div {
+  div.colorbar {
     display: flex;
-    gap: 5pt;
-    width: max-content;
+    box-sizing: border-box;
+    place-items: center;
+    gap: var(--cbar-gap, 5pt);
+    margin: var(--cbar-margin);
+    padding: var(--cbar-padding);
+    width: var(--cbar-wrapper-width);
+  }
+  div.colorbar > div {
+    position: relative;
+    height: var(--cbar-height, 1em);
+    width: var(--cbar-width, 10em);
+    border-radius: var(--cbar-border-radius, 2pt);
   }
-  div > div {
-    border-radius: 2pt;
-    height: 1em;
-    width: 10em;
+  div.colorbar > div > span {
+    position: absolute;
+    transform: translate(-50%);
+    font-weight: var(--cbar-tick-label-font-weight, lighter);
+    font-size: var(--cbar-tick-label-font-size, 10pt);
+    color: var(--cbar-tick-label-color);
+    background: var(--cbar-tick-label-bg);
   }
 </style>
diff --git a/src/lib/ColorScaleSelect.svelte b/src/lib/ColorScaleSelect.svelte
index 0cece6e..74c5ada 100644
--- a/src/lib/ColorScaleSelect.svelte
+++ b/src/lib/ColorScaleSelect.svelte
@@ -7,10 +7,12 @@
   export let selected: string[] = [`Viridis`]
   export let minSelect: number = 0
   export let placeholder = `Select a color scale`
+  export let cbar_props: Record<string, unknown> = {}
 
   const options = Object.keys(d3sc)
     .filter((key) => key.startsWith(`interpolate`))
     .map((key) => key.replace(`interpolate`, ``))
+  const wrapper_style = `justify-content: space-between;`
 </script>
 
 <Select
@@ -22,6 +24,6 @@
   {placeholder}
   {...$$props}
 >
-  <ColorBar slot="option" let:option text={option} />
-  <ColorBar slot="selected" let:option text={option} />
+  <ColorBar slot="option" let:option text={option} {...cbar_props} {wrapper_style} />
+  <ColorBar slot="selected" let:option text={option} {...cbar_props} {wrapper_style} />
 </Select>
diff --git a/src/lib/PropertySelect.svelte b/src/lib/PropertySelect.svelte
index d86027d..0af6029 100644
--- a/src/lib/PropertySelect.svelte
+++ b/src/lib/PropertySelect.svelte
@@ -10,8 +10,9 @@
   export let selected: string[] = empty ? [] : [options[1]]
   export let minSelect: number = 0
   export let id: string | null = null
+  export let key: string | null = null
 
-  $: $heatmap_key = heatmap_labels[value ?? ``] ?? null
+  $: $heatmap_key = key = heatmap_labels[value ?? ``] ?? null
 </script>
 
 <Select
diff --git a/src/routes/(demos)/color-bar/+page.md b/src/routes/(demos)/color-bar/+page.md
index c7cc23b..f218b05 100644
--- a/src/routes/(demos)/color-bar/+page.md
+++ b/src/routes/(demos)/color-bar/+page.md
@@ -1,6 +1,26 @@
 `ColorBar.svelte`
 
-ColorBar supports <code>text_side = ['top', 'bottom', 'left', 'right']</code>
+Here's a `ColorBar` with tick labels:
+
+```svelte example stackblitz
+<script>
+  import { ColorBar } from '$lib'
+</script>
+
+{#each [[`Viridis`, `top`, [0, 0.25, 0.5, 0.75, 1]], [`Magma`, `center`, [], [100, 1000]], [`Cividis`, `bottom`, [], [-100, -10]]] as [color_scale, tick_side, tick_labels, range]}
+  <ColorBar
+    text="{color_scale} (tick side={tick_side})"
+    {color_scale}
+    {tick_side}
+    {tick_labels}
+    {range}
+    --cbar-width="100%"
+    --cbar-padding="2em"
+  />
+{/each}
+```
+
+`ColorBar` supports `text_side = ['top', 'bottom', 'left', 'right']`
 
 ```svelte example stackblitz
 <script>
@@ -46,7 +66,7 @@ ColorBar supports <code>text_side = ['top', 'bottom', 'left', 'right']</code>
 </style>
 ```
 
-You can also fat and skinny bars:
+You can make fat and skinny bars:
 
 ```svelte example stackblitz
 <script>
@@ -59,3 +79,57 @@ You can also fat and skinny bars:
 <br />
 <ColorBar text="Viridis" {wrapper_style} style="width: 3em; height: 2em;" />
 ```
+
+`PeriodicTable.svelte` heatmap example with `ColorBar` inside `TableInset`
+
+```svelte example stackblitz code_above
+<script>
+  import {
+    ColorBar,
+    ColorScaleSelect,
+    element_data,
+    PeriodicTable,
+    PropertySelect,
+    TableInset,
+  } from '$lib'
+
+  let color_scale = `Viridis`
+  let heatmap_key
+  $: heatmap_values = heatmap_key
+    ? element_data.map((el) => el[heatmap_key])
+    : []
+  $: heat_range = [Math.min(...heatmap_values), Math.max(...heatmap_values)]
+</script>
+
+<form>
+  <ColorScaleSelect bind:value={color_scale} minSelect={1} />
+  <PropertySelect bind:key={heatmap_key} />
+</form>
+
+<PeriodicTable
+  {heatmap_values}
+  style="margin: 2em auto 4em;"
+  bind:color_scale
+  links="name"
+>
+  <TableInset slot="inset" style="place-items: center; padding: 2em;">
+    <ColorBar
+      color_scale="Viridis"
+      range={heat_range}
+      tick_side="bottom"
+      --cbar-width="100%"
+      --cbar-height="15pt"
+    />
+  </TableInset>
+</PeriodicTable>
+
+<style>
+  form {
+    display: flex;
+    place-items: center;
+    place-content: center;
+    gap: 1em;
+    margin: 2em auto;
+  }
+</style>
+```
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 4a877af..f3bd3ee 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -11,14 +11,16 @@
     TableInset,
   } from '$lib'
   import { property_labels } from '$lib/labels'
-  import { active_category, active_element, heatmap_key, last_element } from '$lib/stores'
+  import { active_category, active_element, last_element } from '$lib/stores'
   import { DemoNav } from '$site'
   import type { Snapshot } from './$types'
 
   let window_width: number
   let color_scale: string
+  let heatmap_key: string | null = null
+  $: heatmap_values = heatmap_key ? element_data.map((el) => el[heatmap_key]) : []
 
-  $: [y_label, y_unit] = property_labels[$heatmap_key] ?? []
+  $: [y_label, y_unit] = property_labels[heatmap_key] ?? []
 
   export const snapshot: Snapshot = {
     capture: () => ({ color_scale }),
@@ -35,12 +37,16 @@
 
 <h1>Periodic Table of Elements</h1>
 
-<label for="heatmap-select">
-  <PropertySelect empty id="heatmap-select" />
-  {#if $heatmap_key}
-    <ColorScaleSelect bind:value={color_scale} minSelect={1} />
+<form>
+  <PropertySelect empty id="heatmap-select" bind:key={heatmap_key} />
+  {#if heatmap_key}
+    <ColorScaleSelect
+      bind:value={color_scale}
+      minSelect={1}
+      cbar_props={{ range: [Math.min(...heatmap_values), Math.max(...heatmap_values)] }}
+    />
   {/if}
-</label>
+</form>
 
 {#if $last_element && window_width > 1100}
   {@const { shells, name, symbol } = $last_element}
@@ -50,7 +56,7 @@
 {/if}
 <PeriodicTable
   tile_props={{ show_name: window_width > 1000 }}
-  heatmap_values={$heatmap_key ? element_data.map((el) => el[$heatmap_key]) : []}
+  {heatmap_values}
   style="margin: 2em auto 4em; max-width: 85vw;"
   bind:color_scale
   bind:active_element={$active_element}
@@ -58,10 +64,10 @@
   links="name"
 >
   <TableInset slot="inset">
-    {#if $heatmap_key}
+    {#if heatmap_key}
       <ElementScatter
         y_lim={[0, null]}
-        y={element_data.map((el) => el[$heatmap_key])}
+        y={element_data.map((el) => el[heatmap_key])}
         {y_label}
         {y_unit}
         on:change={(e) => ($active_element = element_data[e.detail.x - 1])}
@@ -74,7 +80,7 @@
   </TableInset>
 </PeriodicTable>
 
-{#if !$heatmap_key}
+{#if !heatmap_key}
   <ColorCustomizer collapsible={false} />
 {/if}
 
@@ -95,7 +101,7 @@
     top: 2%;
     left: 3%;
   }
-  label {
+  form {
     display: flex;
     place-content: center;
     gap: 1em;
diff --git a/src/routes/[slug]/+page.svelte b/src/routes/[slug]/+page.svelte
index dabeac8..4ba1f69 100644
--- a/src/routes/[slug]/+page.svelte
+++ b/src/routes/[slug]/+page.svelte
@@ -96,10 +96,10 @@
     </p>
   {/if}
 
-  <label>
+  <form>
     <PropertySelect minSelect={1} />
     <ColorScaleSelect bind:value={color_scale} bind:selected minSelect={1} />
-  </label>
+  </form>
   <section class="viz">
     <ElementPhoto
       element={$active_element}
@@ -274,7 +274,7 @@
   table tr:hover {
     background-color: rgba(150, 150, 255, 0.2);
   }
-  label {
+  form {
     display: flex;
     place-content: center;
     gap: 1em;