diff --git a/bin/xss-dimmer b/bin/xss-dimmer
index ab1e9c3..deb3699 100755
--- a/bin/xss-dimmer
+++ b/bin/xss-dimmer
@@ -115,9 +115,30 @@ easing_functions = {
     "ease-out-quint": lambda x: 1 - pow(1 - x, 5),
     "ease-out-expo": lambda x: 1 - pow(2, -10 * x),
     "ease-out-quad": lambda x: 1 - (1 - x) * (1 - x),
+    "ease-out-bounce": (
+        lambda n1, d1: lambda x: n1 * x * x
+        if x < 1 / d1
+        else n1 * pow(x - 1.5 / d1, 2) + 0.75
+        if x < 2 / d1
+        else n1 * pow(x - 2.25 / d1, 2) + 0.9375
+        if (x < 2.5 / d1)
+        else n1 * pow(x - 2.625 / d1, 2) + 0.984375
+    )(7.5625, 2.75),
     "ease-out-elastic": (
         lambda x: pow(2, -10 * x) * math.sin((x * 10 - 0.75) * (2 * math.pi) / 3) + 1
     ),
+    "ease-inout-quad": lambda x: 2 * x * x if x < 0.5 else 1 - pow(-2 * x + 2, 2) / 2,
+    "ease-inout-quart": (
+        lambda x: 8 * x * x * x * x if x < 0.5 else 1 - pow(-2 * x + 2, 4) / 2
+    ),
+    "ease-inout-expo": (
+        lambda x: pow(2, 20 * x - 10) / 2 if x < 0.5 else (2 - pow(2, -20 * x + 10)) / 2
+    ),
+    "ease-inout-bounce": (
+        lambda x: (1 - easing_functions["ease-out-bounce"](1 - 2 * x)) / 2
+        if x < 0.5
+        else (1 + easing_functions["ease-out-bounce"](2 * x - 1)) / 2
+    ),
 }
 
 if __name__ == "__main__":
@@ -133,7 +154,7 @@ if __name__ == "__main__":
     add("--background", help="use a background instead of black")
     add(
         "--easing-function",
-        default="ease-out-circ",
+        default="ease-out-bounce",
         choices=easing_functions.keys(),
         help="easing function for opacity",
     )