diff --git a/icon/maximize-disabled.svg b/icon/maximize-disabled.svg
new file mode 100644
index 0000000..8a65ef5
--- /dev/null
+++ b/icon/maximize-disabled.svg
@@ -0,0 +1,4 @@
+<svg width="10" height="10" viewBox="0 0 10 10" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M10 1H1V3V9V10H2H9H10V9V3V1ZM9 3H2V9H9V3Z" fill="white"/>
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M9 0H0V2V8V9H1H8H9V8V2V0ZM8 2H1V8H8V2Z" fill="#808080"/>
+</svg>
\ No newline at end of file
diff --git a/style.css b/style.css
index 9d50c03..93719fa 100644
--- a/style.css
+++ b/style.css
@@ -266,6 +266,12 @@ input[type="reset"]:disabled,
   background-position: top 2px left 3px;
 }
 
+.title-bar-controls button[aria-label="Maximize"]:disabled {
+  background-image: svg-load("./icon/maximize-disabled.svg");
+  background-repeat: no-repeat;
+  background-position: top 2px left 3px;
+}
+
 .title-bar-controls button[aria-label="Restore"] {
   background-image: svg-load("./icon/restore.svg");
   background-repeat: no-repeat;