diff --git a/SmartAquaViewer/ViewModel/GraphControlViewModel.cs b/SmartAquaViewer/ViewModel/GraphControlViewModel.cs
index aedb43a..9ab0cfc 100644
--- a/SmartAquaViewer/ViewModel/GraphControlViewModel.cs
+++ b/SmartAquaViewer/ViewModel/GraphControlViewModel.cs
@@ -13,6 +13,13 @@ namespace SmartAquaViewer.ViewModel
     {
         public PlotModel Model { get; }
 
+        private List<OxyColor> TankColors = new List<OxyColor>
+        {
+            OxyColor.Parse("#CC4178BE"),
+            OxyColor.Parse("#CCFFFFFF"),
+            OxyColor.Parse("#CC6DE467"),
+        };
+
         public GraphControlViewModel()
         {
             Model = new PlotModel();
@@ -344,8 +351,8 @@ namespace SmartAquaViewer.ViewModel
                 {
                     Title = $"Tank {tankId}",
                     BoxWidth = boxWidth,
-                    Fill = OxyColor.FromAColor(160, colors[k]),
-                    Stroke = colors[k],
+                    Fill = OxyColor.FromAColor(160, TankColors[k]),
+                    Stroke = TankColors[k],
                     StrokeThickness = 1
                 };
 
@@ -762,11 +769,16 @@ namespace SmartAquaViewer.ViewModel
                 StartAngle = 0,
                 StrokeThickness = 0.5,
                 InsideLabelFormat = "{1}\n {0:F2}",
-                InsideLabelPosition = 0.5,
+                InsideLabelPosition = 0.7,
                 OutsideLabelFormat = null, // 라벨은 내부만
                 FontSize = 14,
+                InsideLabelColor = OxyColors.Black
             };
-            if (donut) ps.InnerDiameter = 0.6; // 도넛 모드
+            if (donut)
+            {
+                ps.InnerDiameter = 0.4; // 도넛 모드
+                ps.InsideLabelPosition = 0.5;
+            }
 
             foreach (var (name, value) in finalList)
             {