diff --git a/AxibugEmuOnline.Client/Assets/Script/UI/XMBBackGround.shader b/AxibugEmuOnline.Client/Assets/Script/UI/XMBBackGround.shader
index c335d2d2..0932bd23 100644
--- a/AxibugEmuOnline.Client/Assets/Script/UI/XMBBackGround.shader
+++ b/AxibugEmuOnline.Client/Assets/Script/UI/XMBBackGround.shader
@@ -138,10 +138,8 @@
                 float waveCol2 = waveColor(uv, waveHeight2, maxHeight2, frequency2, power2);
     
                 float3 col = bg;
-                if (uv.y < waveHeight1)
-                    col = waveCol1 * col;
-                if (uv.y < waveHeight2)
-                    col = waveCol2 * col;
+                col = lerp(col, waveCol1 * col, step(uv.y, waveHeight1));
+                col = lerp(col, waveCol2 * col, step(uv.y, waveHeight2));
 
                 // Output to screen
                 fixed4 fragColor = float4(col,1.0);