diff --git a/icons/enter-fullscreen.svg b/icons/enter-fullscreen.svg
new file mode 100644
index 0000000..54d76f5
--- /dev/null
+++ b/icons/enter-fullscreen.svg
@@ -0,0 +1,3 @@
+<svg width="18" height="18" fill="context-fill" fill-opacity="context-fill-opacity" xmlns="http://www.w3.org/2000/svg">
+  <path d="M10 3h3.6l-4 4L11 8.4l4-4V8h2V1h-7zM7 9.6l-4 4V10H1v7h7v-2H4.4l4-4z"/>
+</svg>
diff --git a/icons/exit-fullscreen.svg b/icons/exit-fullscreen.svg
new file mode 100644
index 0000000..cf4e64c
--- /dev/null
+++ b/icons/exit-fullscreen.svg
@@ -0,0 +1,3 @@
+<svg width="18" height="18" fill="context-fill" fill-opacity="context-fill-opacity" xmlns="http://www.w3.org/2000/svg">
+  <path d="M1 12h3.6l-4 4L2 17.4l4-4V17h2v-7H1zM16 .6l-4 4V1h-2v7h7V6h-3.6l4-4z"/>
+</svg>
diff --git a/userContent.css b/userContent.css
index 796d050..13edd55 100644
--- a/userContent.css
+++ b/userContent.css
@@ -39,6 +39,12 @@ video {
 #controlsContainer .duration {
   color: var(--duration-color) !important; /* Original: #929292 */
 }
+#controlsContainer .fullscreenButton {
+  background-image: url("./icons/enter-fullscreen.svg") !important;
+}
+#controlsContainer .fullscreenButton[fullscreened] {
+  background-image: url("./icons/exit-fullscreen.svg") !important;
+}
 
 #controlsContainer .muteButton[noAudio] {
   /* Remove volume button at noAudio */