diff --git a/package.json b/package.json
index 0313b1fa..3a889531 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "dayjs": "^1.10.6",
     "home-assistant-js-websocket": "^5.11.1",
     "lit": "^2.0.0-rc.2",
+    "screenfull": "^5.1.0",
     "zod": "^3.8.2"
   },
   "devDependencies": {
diff --git a/src/card.ts b/src/card.ts
index 5a16a5ad..f60a1bd6 100644
--- a/src/card.ts
+++ b/src/card.ts
@@ -17,6 +17,7 @@ import {
   getLovelace,
   stateIcon,
 } from 'custom-card-helpers';
+import screenfull from 'screenfull';
 
 import { MenuButton, frigateCardConfigSchema } from './types';
 import type {
@@ -191,6 +192,13 @@ export class FrigateCard extends LitElement {
         description: localize('menu.frigate_ui'),
       });
     }
+    if ((this.config.menu_buttons?.fullscreen ?? false) && screenfull.isEnabled) {
+      buttons.set('fullscreen', {
+        icon: screenfull.isFullscreen ? 'mdi:fullscreen-exit' : 'mdi:fullscreen',
+        description: localize('menu.fullscreen'),
+      });
+    }
+
     const entities = this.config.entities || [];
     for (let i = 0; this._hass && i < entities.length; i++) {
       if (!entities[i].show) {
@@ -294,6 +302,11 @@ export class FrigateCard extends LitElement {
           window.open(frigate_url);
         }
         break;
+      case 'fullscreen':
+        if (screenfull.isEnabled) {
+          screenfull.toggle(this);
+        }
+        break;
       default:
         // If it's unknown, it's assumed to be an entity_id.
         fireEvent(this, 'hass-more-info', { entityId: name });
@@ -383,6 +396,25 @@ export class FrigateCard extends LitElement {
     }
   }
 
+  protected _fullScreenHandler(): void {
+    // Re-render after a change to fullscreen mode to take advantage of
+    // the expanded screen real-estate (vs staying in aspect-ratio locked
+    // modes).
+    this.requestUpdate();
+  }
+  connectedCallback(): void {
+    super.connectedCallback();
+    if (screenfull.isEnabled) {
+      screenfull.on('change', this._fullScreenHandler.bind(this));
+    }
+  }
+  disconnectedCallback(): void {
+    if (screenfull.isEnabled) {
+      screenfull.off('change', this._fullScreenHandler.bind(this));
+    }
+    super.disconnectedCallback();
+  }
+
   protected _getAspectRatioPadding(): number | null {
     const aspect_ratio_mode = this.config.dimensions?.aspect_ratio_mode ?? 'dynamic';
 
@@ -391,6 +423,7 @@ export class FrigateCard extends LitElement {
     // dynamic mode (as the aspect_ratio is essentially whatever the media
     // dimensions are).
     if (
+      (screenfull.isEnabled && screenfull.isFullscreen) ||
       aspect_ratio_mode == 'unconstrained' ||
       (!this._view.isGalleryView() && aspect_ratio_mode == 'dynamic' && this._mediaInfo)
     ) {
diff --git a/src/localize/languages/en.json b/src/localize/languages/en.json
index 0d8dd53a..ba5bfb2a 100644
--- a/src/localize/languages/en.json
+++ b/src/localize/languages/en.json
@@ -41,7 +41,8 @@
     "snapshots": "Snapshots Gallery",
     "clip": "Latest Clip",
     "snapshot": "Latest Snapshot",
-    "frigate_ui": "Frigate User Interface"
+    "frigate_ui": "Frigate User Interface",
+    "fullscreen": "Fullscreen"
   },
   "control": {
     "nextprev": "Media Next & Previous Controls",
@@ -93,7 +94,6 @@
     "could_not_resolve": "Could not resolve media URL",
     "no_live_camera": "No live camera",
     "invalid_configuration": "Invalid configuration",
-    "missing_webrtc": "WebRTC component not found",
-    "internal": "Internal error"
+    "missing_webrtc": "WebRTC component not found"
   }
 }
diff --git a/src/scss/card.scss b/src/scss/card.scss
index 4acdb6e7..95715849 100644
--- a/src/scss/card.scss
+++ b/src/scss/card.scss
@@ -1,5 +1,7 @@
 .container {
   position: relative;
+  overflow: auto;
+  height: 100%;
 }
 
 .frigate-card-contents {
@@ -8,6 +10,11 @@
   overflow: auto;
   -ms-overflow-style: none; /* Hide scrollbar: IE and Edge */
   scrollbar-width: none;    /* Hide scrollbar: Firefox */
+
+  // Vertically align items in case the container is larger than the media (e.g.
+  // fullscreen mode, or forced aspect ratios).
+  display: flex;
+  align-items: center;
 }
 
 /* Hide scrollbar for Chrome, Safari and Opera */
@@ -15,7 +22,7 @@
   display: none;
 }
 
-/* The 'hover' menu mode is styling applied outside of the menu itself */
+/* When forcing aspect ratio absolute positioning is required */
 .frigate-card-contents.absolute {
   position: absolute;
   top: 0px;
@@ -24,7 +31,7 @@
   left: 0px;
 }
 
-/* Support the 'hover' menu mode. */
+/* The 'hover' menu mode is styling applied outside of the menu itself */
 .hover-menu {
   z-index: 1;
   transition: all 0.5s ease;
@@ -50,4 +57,31 @@ ha-card {
 
 ha-card a {
   color: var(--primary-text-color, white);
+}
+
+frigate-card-gallery, frigate-card-viewer, frigate-card-live {
+  width: 100%;
+}
+frigate-card-gallery {
+  height: 100%;
+}
+
+// Browsers will reject invalid whole CSS selectors if one selector is bad, so
+// need to use mixin here instead of just comma-separated selectors.
+//  - Related: https://stackoverflow.com/questions/16982449/why-isnt-it-possible-to-combine-vendor-specific-pseudo-elements-classes-into-on
+@mixin fullscreen-ha-card {
+  // Make the background black, to give it the expected fullscreen feel.
+  background-color: black;
+}
+:host(:fullscreen) ha-card {
+  @include fullscreen-ha-card;
+}
+:host(:-webkit-full-screen) ha-card {
+  @include fullscreen-ha-card;
+}
+:host(:-moz-full-screen) ha-card {
+  @include fullscreen-ha-card;
+}
+:host(:-webkit-full-screen) ha-card {
+  @include fullscreen-ha-card;
 }
\ No newline at end of file
diff --git a/src/types.ts b/src/types.ts
index 3b0d22bc..ae41dd8e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -82,6 +82,7 @@ export const frigateCardConfigSchema = z.object({
       clips: z.boolean().default(true),
       snapshots: z.boolean().default(true),
       frigate_ui: z.boolean().default(true),
+      fullscreen: z.boolean().default(false),
     })
     .optional(),
   entities: z