diff --git a/src/Home.tsx b/src/Home.tsx
index d80f116..25c10d7 100644
--- a/src/Home.tsx
+++ b/src/Home.tsx
@@ -21,7 +21,7 @@ import { v4 } from "uuid";
 import { Menu, MenuButton, MenuItem } from "@szhsin/react-menu";
 import "@szhsin/react-menu/dist/index.css";
 import "@szhsin/react-menu/dist/transitions/slide.css";
-import { getColorByLuminance } from "./util/ColorUtil";
+import { getColorByBrightness } from "./util/ColorUtil";
 import { Theme } from "./theme/Theme";
 
 type ConnectionState = "connecting" | "error" | "connected" | "reconnecting";
@@ -183,7 +183,7 @@ const Home: FunctionComponent<{ initial?: number }> = ({ initial = 0 }) => {
       <Button
         context={context}
         text={context.texts.NewGame}
-        color={context.themeManager.theme.primary}
+        color={context.themeManager.theme.holeColor}
         onClick={newGameClick}
       />
     );
@@ -200,10 +200,10 @@ const Home: FunctionComponent<{ initial?: number }> = ({ initial = 0 }) => {
     }
     return <></>;
   };
-  const menuTextColor = getColorByLuminance(
+  const menuTextColor = getColorByBrightness(
     context.themeManager.theme.appBarBgColor,
-    context.themeManager.theme.primary,
-    context.themeManager.theme.primaryLight
+    context.themeManager.theme.textColor,
+    context.themeManager.theme.textLightColor
   );
   return (
     <div
@@ -225,8 +225,8 @@ const Home: FunctionComponent<{ initial?: number }> = ({ initial = 0 }) => {
             borderTopRightRadius: "1vw",
             minWidth: "10vw",
             minHeight: "1vw",
-            background: context.themeManager.theme.primary,
-            color: context.themeManager.theme.primaryLight,
+            background: context.themeManager.theme.textColor,
+            color: context.themeManager.theme.textLightColor,
           }}
         >
           {connectionStateText()}
@@ -313,7 +313,7 @@ const Home: FunctionComponent<{ initial?: number }> = ({ initial = 0 }) => {
             (game?.state === "playing" || game?.state === "initial") && (
               <Button
                 context={context}
-                color={context.themeManager.theme.primary}
+                color={context.themeManager.theme.holeColor}
                 text={context.texts.Leave}
                 onClick={leaveGame}
               />
diff --git a/src/animation/PitAnimator.ts b/src/animation/PitAnimator.ts
index d9c28fc..016f9c1 100644
--- a/src/animation/PitAnimator.ts
+++ b/src/animation/PitAnimator.ts
@@ -12,7 +12,7 @@ import { v4 } from "uuid";
 import { Context } from "../context";
 import BoardViewModelFactory from "../factory/BoardViewModelFactory";
 import { PitViewModelFactory } from "../factory/PitViewModelFactory";
-import { getColorByLuminance } from "../util/ColorUtil";
+import { getColorByBrightness } from "../util/ColorUtil";
 import BoardViewModel from "../viewmodel/BoardViewModel";
 
 const animationUpdateInterval = 300;
@@ -131,7 +131,7 @@ export default class PitAnimator {
       pitViewModel.pitColor = theme.pitGetRivalStonePitAnimateColor;
       pitViewModel.stoneCount = 0;
     }
-    pitViewModel.stoneColor = getColorByLuminance(
+    pitViewModel.stoneColor = getColorByBrightness(
       pitViewModel.pitColor,
       theme.stoneColor,
       theme.stoneLightColor
diff --git a/src/components/BoardView.tsx b/src/components/BoardView.tsx
index 1396aa7..024a7ac 100644
--- a/src/components/BoardView.tsx
+++ b/src/components/BoardView.tsx
@@ -2,7 +2,7 @@ import { Bank, MancalaGame, Pit } from "mancala.js";
 import * as React from "react";
 import { FunctionComponent, useState } from "react";
 import { Context } from "../context";
-import { getColorByLuminance } from "../util/ColorUtil";
+import { getColorByBrightness } from "../util/ColorUtil";
 import BoardViewModel from "../viewmodel/BoardViewModel";
 import PitViewModel from "../viewmodel/PitViewModel";
 
@@ -68,10 +68,10 @@ const StoreView: FunctionComponent<{
   const balls = [...range(pitViewModel.stoneCount)].map((i) => (
     <BallView color={pitViewModel.stoneColor} />
   ));
-  const textColor = getColorByLuminance(
+  const textColor = getColorByBrightness(
     pitViewModel.pitColor,
-    context.themeManager.theme.primary,
-    context.themeManager.theme.primaryLight
+    context.themeManager.theme.textColor,
+    context.themeManager.theme.textLightColor
   );
   return (
     <div
diff --git a/src/components/Button.tsx b/src/components/Button.tsx
index 3ff6867..f1c3a30 100644
--- a/src/components/Button.tsx
+++ b/src/components/Button.tsx
@@ -1,7 +1,7 @@
 import * as React from "react";
 import { FunctionComponent } from "react";
 import { Context } from "../context";
-import { getColorByLuminance } from "../util/ColorUtil";
+import { getColorByBrightness } from "../util/ColorUtil";
 
 const Button: FunctionComponent<{
   context: Context;
@@ -9,10 +9,10 @@ const Button: FunctionComponent<{
   onClick: () => void;
   color: string;
 }> = ({ context, text, color, onClick }) => {
-  const textColor = getColorByLuminance(
+  const textColor = getColorByBrightness(
     color,
-    context.themeManager.theme.primary,
-    context.themeManager.theme.primaryLight
+    context.themeManager.theme.textColor,
+    context.themeManager.theme.textLightColor
   );
   return (
     <button
diff --git a/src/components/InfoPanel.tsx b/src/components/InfoPanel.tsx
index f91c9b3..f38ef0a 100644
--- a/src/components/InfoPanel.tsx
+++ b/src/components/InfoPanel.tsx
@@ -2,7 +2,7 @@ import { MancalaGame } from "mancala.js";
 import * as React from "react";
 import { FunctionComponent } from "react";
 import { Context } from "../context";
-import { getColorByLuminance } from "../util/ColorUtil";
+import { getColorByBrightness } from "../util/ColorUtil";
 
 function getInfoPanelTextByGameState(params: {
   context: Context;
@@ -86,11 +86,11 @@ const InfoPanel: FunctionComponent<{
     const isUserTurn = game?.checkIsPlayerTurn(userKey);
     const containerColor = isUserTurn
       ? context.themeManager.theme.playerTurnColor
-      : context.themeManager.theme.holeColor;
-    const textColor = getColorByLuminance(
+      : context.themeManager.theme.boardColor;
+    const textColor = getColorByBrightness(
       containerColor,
-      context.themeManager.theme.primary,
-      context.themeManager.theme.primaryLight
+      context.themeManager.theme.textColor,
+      context.themeManager.theme.textLightColor
     );
     const text = getInfoPanelTextByGameState({
       context,
diff --git a/src/theme/DarkGrey.ts b/src/theme/DarkGrey.ts
deleted file mode 100644
index ae8b4d2..0000000
--- a/src/theme/DarkGrey.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import { Theme } from "./Theme";
-
-// https://colorhunt.co/palette/525252414141313131ec625f
-const colors = {
-  primary: "#414141",
-  secondary: "#313131",
-  tertiary: "#606060",
-  quaternary: "#808080",
-};
-
-const colorSpecial = "#337a44";
-
-const darkGreyTheme: Theme = {
-  id: "3",
-  name: "Dark Grey Theme",
-  background: colors.primary,
-  appBarBgColor: colors.secondary,
-  primary: colors.primary,
-  primaryLight: "#aaaaaa",
-  playerTurnColor: colors.secondary,
-  boardColor: colors.secondary,
-  holeColor: colors.tertiary,
-  pitSelectedColor: colors.secondary,
-  stoneColor: "#252525",
-  stoneLightColor: "#252525",
-  pitGameMoveAnimateColor: colors.quaternary,
-  pitEmptyPitAnimateColor: colorSpecial,
-  pitLastStoneInBankPitAnimateColor: colorSpecial,
-  pitGetRivalStonePitAnimateColor: colorSpecial,
-};
-
-export default darkGreyTheme;
diff --git a/src/theme/DarkTheme.ts b/src/theme/DarkTheme.ts
index 7544f28..b7ab619 100644
--- a/src/theme/DarkTheme.ts
+++ b/src/theme/DarkTheme.ts
@@ -1,28 +1,28 @@
 import { Theme } from "./Theme";
 
-// from https://colorhunt.co/palette/0f0e0e5412128b9a46eeeeee
+// https://colorhunt.co/palette/525252414141313131ec625f
 const colors = {
-  primary: "#541212",
-  secondary: "#0F0E0E",
-  tertiary: "#8B9A46",
-  quaternary: "#EEEEEE",
+  primary: "#414141",
+  secondary: "#313131",
+  tertiary: "#606060",
+  quaternary: "#808080",
 };
 
-const colorSpecial = "#990000";
+const colorSpecial = "#337a44";
 
 const darkTheme: Theme = {
   id: "2",
   name: "Dark Theme",
   background: colors.primary,
   appBarBgColor: colors.secondary,
-  primary: colors.primary,
-  primaryLight: colors.quaternary,
-  playerTurnColor: colors.secondary,
+  textColor: colors.primary,
+  textLightColor: "#AAAAAA",
+  playerTurnColor: colors.tertiary,
   boardColor: colors.secondary,
   holeColor: colors.tertiary,
-  pitSelectedColor: colors.tertiary,
-  stoneColor: colors.primary,
-  stoneLightColor: colors.tertiary,
+  pitSelectedColor: colors.secondary,
+  stoneColor: "#252525",
+  stoneLightColor: "#252525",
   pitGameMoveAnimateColor: colors.quaternary,
   pitEmptyPitAnimateColor: colorSpecial,
   pitLastStoneInBankPitAnimateColor: colorSpecial,
diff --git a/src/theme/DefaultTheme.ts b/src/theme/DefaultTheme.ts
deleted file mode 100644
index c5ec0d7..0000000
--- a/src/theme/DefaultTheme.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import { Theme } from "./Theme";
-
-// https://colorhunt.co/palette/7d5a50b4846ce5b299fcdec0
-const colors = {
-  primary: "#7D5A50",
-  secondary: "#B4846C",
-  tertiary: "#E5B299",
-  quaternary: "#FCDEC0",
-};
-
-const colorSpecial = "#F6A9A9";
-
-const defaultTheme: Theme = {
-  id: "1",
-  name: "Default Light Theme",
-  background: "#EEEEEE",
-  appBarBgColor: colors.quaternary,
-  primary: colors.primary,
-  primaryLight: colors.quaternary,
-  playerTurnColor: colors.secondary,
-  boardColor: colors.secondary,
-  holeColor: colors.quaternary,
-  pitSelectedColor: colors.tertiary,
-  stoneColor: colors.primary,
-  stoneLightColor: colors.tertiary,
-  pitGameMoveAnimateColor: colors.tertiary,
-  pitEmptyPitAnimateColor: colorSpecial,
-  pitLastStoneInBankPitAnimateColor: colorSpecial,
-  pitGetRivalStonePitAnimateColor: colorSpecial,
-};
-
-export default defaultTheme;
diff --git a/src/theme/OldTheme.ts b/src/theme/GreyTheme.ts
similarity index 75%
rename from src/theme/OldTheme.ts
rename to src/theme/GreyTheme.ts
index 9fb889e..322b026 100644
--- a/src/theme/OldTheme.ts
+++ b/src/theme/GreyTheme.ts
@@ -1,12 +1,12 @@
 import { Theme } from "./Theme";
 
-const oldTheme: Theme = {
-  id: "0",
-  name: "Old Theme",
+const greyTheme: Theme = {
+  id: "1",
+  name: "Grey Theme",
   background: "#EEEEEE",
   appBarBgColor: "#e4e4e4",
-  primary: "#4D606E",
-  primaryLight: "#EEEEEE",
+  textColor: "#4D606E",
+  textLightColor: "#EEEEEE",
   playerTurnColor: "#84b8a6",
   boardColor: "#4D606E",
   holeColor: "#D3D4D8",
@@ -19,4 +19,4 @@ const oldTheme: Theme = {
   pitGetRivalStonePitAnimateColor: "#ff3d44",
 };
 
-export default oldTheme;
+export default greyTheme;
diff --git a/src/theme/LightTheme.ts b/src/theme/LightTheme.ts
new file mode 100644
index 0000000..89ddf9e
--- /dev/null
+++ b/src/theme/LightTheme.ts
@@ -0,0 +1,24 @@
+import { Theme } from "./Theme";
+
+const colorSpecial = "#8B8B8B";
+
+const lightTheme: Theme = {
+  id: "1",
+  name: "Light Theme",
+  background: "#BBBBBB",
+  appBarBgColor: "#7B7B7B",
+  textColor: "#5B5B5B",
+  textLightColor: "#EBEBEB",
+  playerTurnColor: "#6B6B6B",
+  boardColor: "#9B9B9B",
+  holeColor: "#B8B8B8",
+  pitSelectedColor: "#9B9B9B",
+  stoneColor: "#5B5B5B",
+  stoneLightColor: "#3B3B3B",
+  pitGameMoveAnimateColor: "#ABABAB",
+  pitEmptyPitAnimateColor: colorSpecial,
+  pitLastStoneInBankPitAnimateColor: colorSpecial,
+  pitGetRivalStonePitAnimateColor: colorSpecial,
+};
+
+export default lightTheme;
diff --git a/src/theme/Theme.ts b/src/theme/Theme.ts
index e5a9653..26a3e0f 100644
--- a/src/theme/Theme.ts
+++ b/src/theme/Theme.ts
@@ -1,8 +1,8 @@
 export type Theme = {
   id: string;
   name: string;
-  primary: string;
-  primaryLight: string;
+  textColor: string;
+  textLightColor: string;
   background: string;
   appBarBgColor: string;
   playerTurnColor: string;
diff --git a/src/theme/ThemeManager.ts b/src/theme/ThemeManager.ts
index fe6a791..4260147 100644
--- a/src/theme/ThemeManager.ts
+++ b/src/theme/ThemeManager.ts
@@ -1,10 +1,9 @@
-import darkGreyTheme from "./DarkGrey";
-import darkTheme from "./DarkTheme";
-import defaultTheme from "./DefaultTheme";
-import oldTheme from "./OldTheme";
+import lightTheme from "./LightTheme";
+import greyTheme from "./GreyTheme";
 import { Theme } from "./Theme";
+import darkTheme from "./DarkTheme";
 
-export const themes = [defaultTheme, darkGreyTheme, darkTheme, oldTheme];
+export const themes = [lightTheme, darkTheme, greyTheme];
 
 const THEME_ID = "theme_id";
 
@@ -12,7 +11,7 @@ export default class ThemeManager {
   _theme: Theme;
   onThemeChange: (theme: Theme) => void;
   constructor() {
-    this._theme = this.readFromLocalStorage() || defaultTheme;
+    this._theme = this.readFromLocalStorage() || lightTheme;
   }
 
   public get theme() {
diff --git a/src/util/ColorUtil.ts b/src/util/ColorUtil.ts
index 5f82d97..b19a362 100644
--- a/src/util/ColorUtil.ts
+++ b/src/util/ColorUtil.ts
@@ -1,31 +1,11 @@
-//from this gist https://gist.github.com/jfsiii/5641126
 
-// from http://www.w3.org/TR/WCAG20/#relativeluminancedef
-export function relativeLuminanceW3C(
-  R8bit: number,
-  G8bit: number,
-  B8bit: number
-) {
-  const RsRGB = R8bit / 255;
-  const GsRGB = G8bit / 255;
-  const BsRGB = B8bit / 255;
-
-  const R =
-    RsRGB <= 0.03928 ? RsRGB / 12.92 : Math.pow((RsRGB + 0.055) / 1.055, 2.4);
-  const G =
-    GsRGB <= 0.03928 ? GsRGB / 12.92 : Math.pow((GsRGB + 0.055) / 1.055, 2.4);
-  const B =
-    BsRGB <= 0.03928 ? BsRGB / 12.92 : Math.pow((BsRGB + 0.055) / 1.055, 2.4);
-
-  // For the sRGB colorspace, the relative luminance of a color is defined as:
-  const L = 0.2126 * R + 0.7152 * G + 0.0722 * B;
-
-  return L;
+export function getBrightness(r: number, g: number, b: number) {
+  return (r * 299 + g * 587 + b * 114) / 1000;
 }
 
-export function relativeLuminanceW3CHexColor(hexColor: string): number {
+export function getBrightnessFromHexColor(hexColor: string): number {
   const [r, g, b] = hexToRgb(hexColor);
-  return relativeLuminanceW3C(r, g, b);
+  return getBrightness(r, g, b);
 }
 
 // from https://www.codegrepper.com/code-examples/javascript/javascript+convert+color+string+to+rgb
@@ -42,10 +22,10 @@ export function hexToRgb(
   //returns [23, 14, 45] -> reformat if needed
 }
 
-export function getColorByLuminance(
+export function getColorByBrightness(
   color: string,
   lightColor: string,
   darkColor: string
 ): string {
-  return relativeLuminanceW3CHexColor(color) < 0.5 ? darkColor : lightColor;
+  return getBrightnessFromHexColor(color) < 125 ? darkColor : lightColor;
 }