diff --git a/elements/app.js b/elements/app.js
index ed72a102..844a986b 100644
--- a/elements/app.js
+++ b/elements/app.js
@@ -25,6 +25,7 @@ class App extends LitElement {
         --highlight-text: white;
         --selected-background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAAAAABX3VL4AAAADklEQVQIHWP4f4DhwH8ACoADf16N/DIAAAAASUVORK5CYII=');
         --z-index-menu: 10;
+        --z-index-dialog: 20;
 
         font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
           Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji',
diff --git a/elements/index.js b/elements/index.js
index b094682f..8cbbb457 100644
--- a/elements/index.js
+++ b/elements/index.js
@@ -1,3 +1,4 @@
+import './window/window.js';
 import './app.js';
 import './canvas.js';
 import './color-box.js';
diff --git a/elements/window/window.js b/elements/window/window.js
new file mode 100644
index 00000000..c6aedd4d
--- /dev/null
+++ b/elements/window/window.js
@@ -0,0 +1,122 @@
+import { css, html, LitElement } from '../../web_modules/lit-element.js';
+
+export class Window extends LitElement {
+  static get properties() {
+    return {
+      caption: { type: String },
+    };
+  }
+
+  static get styles() {
+    return css`
+      :host {
+        border: 1px solid var(--button-face);
+        border-right-color: var(--button-text);
+        border-bottom-color: var(--button-text);
+        background-color: var(--button-face);
+        display: flex;
+        position: absolute;
+        z-index: var(--z-index-dialog);
+      }
+
+      .wrapper {
+        border: 1px solid var(--highlight-text);
+        border-right-color: var(--canvas);
+        border-bottom-color: var(--canvas);
+        padding: 1px;
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+      }
+
+      div.title-bar {
+        background-color: var(--highlight);
+        color: var(--highlight-text);
+        height: 18px;
+        display: flex;
+        font-weight: bold;
+        align-items: center;
+        box-sizing: border-box;
+        padding: 1px 2px;
+        margin-bottom: 1px;
+      }
+
+      div.title-bar span.title {
+        flex: 1;
+      }
+
+      paint-window-title-bar-button:last-of-type {
+        margin-left: 2px;
+      }
+    `;
+  }
+
+  constructor() {
+    super();
+
+    this.pointerMoveListener = this.onPointerMove.bind(this);
+    this.pointerUpListener = this.onPointerUp.bind(this);
+    document.addEventListener('pointermove', this.pointerMoveListener);
+    document.addEventListener('pointerup', this.pointerUpListener);
+
+    this.position = { x: 100, y: 50 };
+    this.moveWindow();
+  }
+
+  render() {
+    return html`
+      <div class="wrapper">
+        <div class="title-bar" @pointerdown="${this.onPointerDown}">
+          <span class="title">${this.caption}</span>
+          <paint-window-title-bar-button help></paint-window-title-bar-button>
+          <paint-window-title-bar-button
+            close
+            @click="${this.onClose}"
+          ></paint-window-title-bar-button>
+        </div>
+        <div class="content">
+          <slot></slot>
+        </div>
+      </div>
+    `;
+  }
+
+  disconnectedCallback() {
+    super.disconnectedCallback();
+
+    document.removeEventListener('pointermove', this.pointerMoveListener);
+    document.removeEventListener('pointerup', this.pointerUpListener);
+  }
+
+  onPointerDown({ clientX, clientY }) {
+    this.mousePosition = { clientX, clientY };
+  }
+
+  onPointerMove({ clientX, clientY }) {
+    // TODO: Disallow moving out of bounds
+    if (this.mousePosition) {
+      const deltaX = clientX - this.mousePosition.clientX;
+      const deltaY = clientY - this.mousePosition.clientY;
+      this.position.x = this.position.x + deltaX;
+      this.position.y = this.position.y + deltaY;
+      this.mousePosition = { clientX, clientY };
+      this.moveWindow();
+    }
+  }
+
+  onPointerUp() {
+    this.mousePosition = null;
+  }
+
+  moveWindow() {
+    this.style.transform = `translate(${this.position.x}px, ${this.position.y}px)`;
+  }
+
+  onClose() {
+    this.dispatchEvent(
+      new CustomEvent('close', { bubbles: true, composed: true }),
+    );
+  }
+}
+
+customElements.define('paint-window', Window);