keep to conventions if it is onClick just call it onClick not callback

src/TicTacToe/Root.tsx

@@ -1,6 +1,6 @@
-import React from 'react';
+import React from "react";
-import { useState } from 'react';
+import { useState } from "react";
-import './style.css';
+import "./style.css";
 
 function TicTacToe() {
   const [gridState, setGridState] = useState(Array(9).fill(0));
@@ -8,28 +8,19 @@ function TicTacToe() {
   const [winState, setWinState] = useState(0);
   let localWinState = winState;
 
-	function updateGridState(index : number, state : number) {
+  function updateGridState(index: number, state: number) {
     gridState[index] = state;
     setGridState(gridState);
   }
 
-	function resetGridState() {
+  function playTurn(index: number) {
-		setGridState(Array(9).fill(0));
-		setPlayerState(false);
-		setWinState(0);
-	}
-
-	function playTurn(index : number) {
-		if (winState) {
-			resetGridState()
-			return;
-		}
     if (gridState[index]) return;
+    if (winState) return;
 
     const newState = playerState ? 2 : 1;
     updateGridState(index, newState);
 
-		const winner = checkWinCondition()
+    const winner = checkWinCondition();
     if (winner) {
       localWinState = winner;
       setWinState(winner);
@@ -39,17 +30,12 @@ function TicTacToe() {
     setPlayerState(!playerState);
   }
 
-	function checkWinCondition() : number {
+  function checkWinCondition(): number {
-
+    function getWinningValue(a: number, b: number, c: number) {
-		function getWinningValue(
+      if (a === b && b === c && a === c) {
-				a : number, 
-				b : number, 
-				c : number 
-		) {
-			if ((a === b) && (b === c) && (a === c)) {
         return a;
       }
-			return 0
+      return 0;
     }
     /*
      * Diagonals
@@ -90,9 +76,9 @@ function TicTacToe() {
     const isDrawState = () => {
       for (let i in gridState) {
         if (!gridState[i]) return false;
-			};
-			return true;
       }
+      return true;
+    };
     if (isDrawState()) return 3;
 
     return 0;
@@ -100,26 +86,26 @@ function TicTacToe() {
 
   let stateString = "";
   if (localWinState === 3) {
-		stateString = `Game draw.`
+    stateString = `Game draw.`;
-	}
+  } else if (localWinState) {
-	else if (localWinState) {
     stateString = `Player ${getStateChar(localWinState)} wins.`;
-	}
+  } else {
-	else {
+    stateString = `Player ${getStateChar(playerState ? 2 : 1)} turn.`;
-		stateString = `Player ${getStateChar(playerState ? 2 : 1)} turn.`
   }
 
   return (
     <div className="TicTacToe">
       <h1>{stateString}</h1>
       <div className="TicTacToeGrid">
-				{
+        {gridState.map((item, index) => {
-					gridState.map((item, index) => {
+          const getState = () => {
-						const state = gridState[index];
+            return gridState[index];
-						const onClick = () => { playTurn(index) };
+          };
-						return (<TicTacToeCell state={state} onClick={onClick}/>);
+          const callback = () => {
-					})
+            playTurn(index);
-				}
+          };
+          return <TicTacToeCell state={gridState[index]} onClick={callback} />;
+        })}
       </div>
     </div>
   );
@@ -131,7 +117,6 @@ interface CellProps {
 }
 
 function TicTacToeCell({ state, onClick }: CellProps) {
-
   return (
     <div className={`TicTacToeCell ${getStateClass(state)}`} onClick={onClick}>
       <p>{getStateChar(state)}</p>
@@ -139,7 +124,7 @@ function TicTacToeCell({ state, onClick }: CellProps) {
   );
 }
 
-function getStateChar(state : number) {
+function getStateChar(state: number) {
   switch (state) {
     case 1:
       return "O";
@@ -150,7 +135,7 @@ function getStateChar(state : number) {
   }
 }
 
-function getStateClass(state : number) {
+function getStateClass(state: number) {
   switch (state) {
     case 1:
       return "CellRed";

src/TicTacToe/style.css

@@ -1,13 +1,12 @@
 .TicTacToe {
 	background-color: #3B3E49;
 	color: #B9B8D6;
-	border-radius: 20px;
 }
 
 .TicTacToeGrid {
 	display: grid;
-	min-width: 50vw;
+	width: 50vh;
-	min-height: 50vw;
+	height: 50vh;
 	grid-template-columns: auto auto auto;
 }
 
@@ -30,7 +29,6 @@
 	left: 50%;
 	top: 50%;
 	transform: translate(-50%, -50%);
-	font-size: 10vw;
 }
 
 .CellRed {