diff --git a/packages/overlays/docs/GlobalOverlayController.md b/packages/overlays/docs/GlobalOverlayController.md
index 86d913845..b71fad00a 100644
--- a/packages/overlays/docs/GlobalOverlayController.md
+++ b/packages/overlays/docs/GlobalOverlayController.md
@@ -26,9 +26,17 @@ const myCtrl = overlays.add(
 );
 ```
 
+### BottomsheetController
+
+A specific extension of GlobalOverlayController configured to create accessible dialogs at the bottom of the screen.
+
+```js
+import { BottomsheetController } from '@lion/overlays';
+```
+
 ### ModalDialogController
 
-A specific extension of GlobalOverlayController configured to create accessible modal dialogs.
+A specific extension of GlobalOverlayController configured to create accessible modal dialogs placed in the center of the screen.
 
 ```js
 import { ModalDialogController } from '@lion/overlays';
diff --git a/packages/overlays/index.js b/packages/overlays/index.js
index 03c9d5595..8c1e18018 100644
--- a/packages/overlays/index.js
+++ b/packages/overlays/index.js
@@ -2,6 +2,7 @@ export { DynamicOverlayController } from './src/DynamicOverlayController.js';
 export { GlobalOverlayController } from './src/GlobalOverlayController.js';
 export { globalOverlaysStyle } from './src/globalOverlaysStyle.js';
 export { LocalOverlayController } from './src/LocalOverlayController.js';
+export { BottomsheetController } from './src/BottomsheetController.js';
 export { ModalDialogController } from './src/ModalDialogController.js';
 export { overlays } from './src/overlays.js';
 export { OverlaysManager } from './src/OverlaysManager.js';
diff --git a/packages/overlays/src/BottomsheetController.js b/packages/overlays/src/BottomsheetController.js
new file mode 100644
index 000000000..12e2c2dc1
--- /dev/null
+++ b/packages/overlays/src/BottomsheetController.js
@@ -0,0 +1,16 @@
+import { GlobalOverlayController } from './GlobalOverlayController.js';
+
+export class BottomsheetController extends GlobalOverlayController {
+  constructor(params) {
+    super({
+      hasBackdrop: true,
+      preventsScroll: true,
+      trapsKeyboardFocus: true,
+      hidesOnEsc: true,
+      viewportConfig: {
+        placement: 'bottom',
+      },
+      ...params,
+    });
+  }
+}
diff --git a/packages/overlays/src/globalOverlaysStyle.js b/packages/overlays/src/globalOverlaysStyle.js
index ff872fe31..f9667c9b2 100644
--- a/packages/overlays/src/globalOverlaysStyle.js
+++ b/packages/overlays/src/globalOverlaysStyle.js
@@ -4,11 +4,6 @@ export const globalOverlaysStyle = css`
   .global-overlays {
     position: fixed;
     z-index: 200;
-    left: 0;
-    top: 0;
-    width: 100vw;
-    height: 100vh;
-    pointer-events: none;
   }
 
   .global-overlays__overlay,
@@ -16,6 +11,60 @@ export const globalOverlaysStyle = css`
     pointer-events: auto;
   }
 
+  .global-overlays__overlay-container {
+    display: flex;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+  }
+
+  .global-overlays__overlay-container--top-left {
+    justify-content: flex-start;
+    align-items: flex-start;
+  }
+
+  .global-overlays__overlay-container--top {
+    justify-content: center;
+    align-items: flex-start;
+  }
+
+  .global-overlays__overlay-container--top-right {
+    justify-content: flex-end;
+    align-items: flex-start;
+  }
+
+  .global-overlays__overlay-container--right {
+    justify-content: flex-end;
+    align-items: center;
+  }
+
+  .global-overlays__overlay-container--bottom-left {
+    justify-content: flex-start;
+    align-items: flex-end;
+  }
+
+  .global-overlays__overlay-container--bottom {
+    justify-content: center;
+    align-items: flex-end;
+  }
+
+  .global-overlays__overlay-container--bottom-right {
+    justify-content: flex-end;
+    align-items: flex-end;
+  }
+  .global-overlays__overlay-container--left {
+    justify-content: flex-start;
+    align-items: center;
+  }
+
+  .global-overlays__overlay-container--center {
+    justify-content: center;
+    align-items: center;
+  }
+
   .global-overlays.global-overlays--blocking-opened .global-overlays__overlay {
     display: none;
   }
@@ -30,9 +79,10 @@ export const globalOverlaysStyle = css`
     content: '';
     position: fixed;
     top: 0;
-    right: 0;
-    bottom: 0;
     left: 0;
+    width: 100%;
+    height: 100%;
+    z-index: -1;
     background-color: #333333;
     opacity: 0.3;
   }
@@ -46,19 +96,6 @@ export const globalOverlaysStyle = css`
     opacity: 0;
   }
 
-  .global-overlays.global-overlays--backdrop-fade-out {
-    content: '';
-    position: fixed;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    left: 0;
-    background-color: #333333;
-    opacity: 0;
-    pointer-events: none;
-    animation: global-overlays-backdrop-fade-out 300ms;
-  }
-
   @keyframes global-overlays-backdrop-fade-in {
     from {
       opacity: 0;
diff --git a/packages/overlays/stories/bottomsheet.stories.js b/packages/overlays/stories/bottomsheet.stories.js
new file mode 100644
index 000000000..fd6d363fe
--- /dev/null
+++ b/packages/overlays/stories/bottomsheet.stories.js
@@ -0,0 +1,47 @@
+import { storiesOf, html } from '@open-wc/demoing-storybook';
+
+import { css } from '@lion/core';
+import { overlays, BottomsheetController } from '../index.js';
+
+const bottomsheetDemoStyle = css`
+  .demo-overlay {
+    width: 100%;
+    background-color: white;
+    border: 1px solid lightgrey;
+    text-align: center;
+    height: 800px;
+  }
+`;
+
+storiesOf('Global Overlay System|Bottomsheet', module).add('Default', () => {
+  const bottomsheetCtrl = overlays.add(
+    new BottomsheetController({
+      contentTemplate: () => html`
+        <div class="demo-overlay">
+          <p>Bottomsheet</p>
+          <button @click="${() => bottomsheetCtrl.hide()}">Close</button>
+        </div>
+      `,
+    }),
+  );
+
+  return html`
+    <style>
+      ${bottomsheetDemoStyle}
+    </style>
+    <a href="#">Anchor 1</a>
+    <button
+      @click="${event => bottomsheetCtrl.show(event.target)}"
+      aria-haspopup="dialog"
+      aria-expanded="false"
+    >
+      Open dialog
+    </button>
+    <a href="#">Anchor 2</a>
+    ${Array(50).fill(
+      html`
+        <p>Lorem ipsum</p>
+      `,
+    )}
+  `;
+});
diff --git a/packages/overlays/stories/index.stories.js b/packages/overlays/stories/index.stories.js
index 68ba08504..a92071c3a 100644
--- a/packages/overlays/stories/index.stories.js
+++ b/packages/overlays/stories/index.stories.js
@@ -1,5 +1,6 @@
 import './global-overlay.stories.js';
 import './modal-dialog.stories.js';
+import './bottomsheet.stories.js';
 import './local-overlay.stories.js';
 import './local-overlay-placement.stories.js';
 import './dynamic-overlay.stories.js';
diff --git a/packages/overlays/test/BottomsheetController.test.js b/packages/overlays/test/BottomsheetController.test.js
new file mode 100644
index 000000000..ad4152f78
--- /dev/null
+++ b/packages/overlays/test/BottomsheetController.test.js
@@ -0,0 +1,32 @@
+import { expect, html } from '@open-wc/testing';
+
+import { GlobalOverlayController } from '../src/GlobalOverlayController.js';
+import { BottomsheetController } from '../src/BottomsheetController.js';
+
+describe('BottomsheetController', () => {
+  let defaultOptions;
+
+  before(() => {
+    defaultOptions = {
+      contentTemplate: () => html`
+        <p>my content</p>
+      `,
+    };
+  });
+
+  it('extends GlobalOverlayController', () => {
+    expect(new BottomsheetController(defaultOptions)).to.be.instanceof(GlobalOverlayController);
+  });
+
+  it('has correct defaults', () => {
+    const controller = new BottomsheetController(defaultOptions);
+    expect(controller.hasBackdrop).to.equal(true);
+    expect(controller.isBlocking).to.equal(false);
+    expect(controller.preventsScroll).to.equal(true);
+    expect(controller.trapsKeyboardFocus).to.equal(true);
+    expect(controller.hidesOnEsc).to.equal(true);
+    expect(controller.overlayContainerPlacementClass).to.equal(
+      'global-overlays__overlay-container--bottom',
+    );
+  });
+});
diff --git a/packages/overlays/test/GlobalOverlayController.test.js b/packages/overlays/test/GlobalOverlayController.test.js
index eced02a92..62f2c8010 100644
--- a/packages/overlays/test/GlobalOverlayController.test.js
+++ b/packages/overlays/test/GlobalOverlayController.test.js
@@ -349,7 +349,7 @@ describe('GlobalOverlayController', () => {
       });
 
       controller.show();
-      expect(controller.overlayContainerClass).to.equal(
+      expect(controller.overlayContainerPlacementClass).to.equal(
         'global-overlays__overlay-container--center',
       );
     });
@@ -377,7 +377,7 @@ describe('GlobalOverlayController', () => {
             `,
         });
         controller.show();
-        expect(controller.overlayContainerClass).to.equal(
+        expect(controller.overlayContainerPlacementClass).to.equal(
           `global-overlays__overlay-container--${viewportPlacement}`,
         );
       });
diff --git a/packages/overlays/test/ModalDialogController.test.js b/packages/overlays/test/ModalDialogController.test.js
index 8beaeb935..1a01c3bd3 100644
--- a/packages/overlays/test/ModalDialogController.test.js
+++ b/packages/overlays/test/ModalDialogController.test.js
@@ -25,6 +25,8 @@ describe('ModalDialogController', () => {
     expect(ctrl.preventsScroll).to.be.true;
     expect(ctrl.trapsKeyboardFocus).to.be.true;
     expect(ctrl.hidesOnEsc).to.be.true;
-    expect(ctrl.overlayContainerClass).to.equal('global-overlays__overlay-container--center');
+    expect(ctrl.overlayContainerPlacementClass).to.equal(
+      'global-overlays__overlay-container--center',
+    );
   });
 });