CSSを追加

src/App.css

@@ -1,38 +1,63 @@
-.App {
-  text-align: center;
+/* App.css */
+
+:root {
+  --background: #333;
+  --text: #f2f2f2;
+  --border: #666;
 }
 
-.App-logo {
-  height: 40vmin;
-  pointer-events: none;
+body {
+  background-color: var(--background);
+  color: var(--text);
 }
 
-@media (prefers-reduced-motion: no-preference) {
-  .App-logo {
-    animation: App-logo-spin infinite 20s linear;
-  }
+.game {
+  display: flex;
+  flex-direction: row;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
 }
 
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
+.game-board {
+  margin-right: 50px;
+}
+
+.game-info {
   display: flex;
   flex-direction: column;
-  align-items: center;
+  align-items: flex-start;
+  font-size: 20px;
+}
+
+ol {
+  padding-left: 0;
+}
+
+ol li {
+  list-style-type: none;
+}
+
+.board-row {
+  display: flex;
   justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
 }
 
-.App-link {
-  color: #61dafb;
+.square {
+  width: 60px;
+  height: 60px;
+  background-color: var(--background);
+  border: 1px solid var(--border);
+  color: var(--text);
+  font-size: 24px;
+  font-weight: bold;
+  line-height: 60px;
+  text-align: center;
 }
 
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
+.status {
+  font-size: 24px;
+  font-weight: bold;
+  margin-bottom: 15px;
+  text-align: center;
 }

src/components/Square.js

@@ -1,5 +1,4 @@
 import '../App.css';
-import PropTypes from 'prop-types';
 
 function Square({value, onSquareClick}) {
   return (<button className="square" onClick={onSquareClick}>{value}</button>);