diff --git a/library/yuvrot.wgsl b/library/yuvrot.wgsl
index af1c97ef..be29ad03 100644
--- a/library/yuvrot.wgsl
+++ b/library/yuvrot.wgsl
@@ -7,8 +7,8 @@ fn main(uv: vec2<f32>) -> vec4<f32> {
     let t = select(iIntensity * 2. * pi, iTime * iFrequency * pi, iFrequency != 0.);
     let u_v = yuv.gb * 2.;
     let u_v2 = u_v - 1.;
-    let u_v3 = vec2<f32>(u_v2.x * cos(t) - yuv.b * sin(t),
-                        u_v2.y * sin(t) + yuv.b * cos(t));
+    let u_v3 = vec2<f32>(u_v2.x * cos(t) - u_v2.y * sin(t),
+                        u_v2.x * sin(t) + u_v2.y * cos(t));
     let u_v4 = u_v3 + 1.;
     let u_v5 = u_v4 / 2.;
 
diff --git a/src/bin/main.rs b/src/bin/main.rs
index 9b53ecde..57f1247d 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -698,7 +698,7 @@ impl App<'_> {
                 },
                 |ui| {
                     egui::Frame::NONE
-                      .fill(egui::Color32::from_rgba_premultiplied(25, 25, 25, 250))
+                      .fill(egui::Color32::from_rgba_premultiplied(23, 23, 23, 230))
                       .show(ui, |ui| {
                         ui.horizontal(|ui| {
                             ui.set_min_width(ui.available_width());