Component 'square'

src/App.js

@@ -1,24 +1,11 @@
-import logo from './logo.svg';
 import './App.css';
 
 function App() {
   return (
-    <div className="App">
+  <>
-      <header className="App-header">
+    <button className="square">X</button>
-        <img src={logo} className="App-logo" alt="logo" />
+    <button className="square">X</button>
-        <p>
+  </>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
-    </div>
   );
 }
 

src/index.css

@@ -11,3 +11,18 @@ code {
   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
     monospace;
 }
+
+.square {
+  background: #fff;
+  border: 1px solid #999;
+  float: left;
+  font-size: 24px;
+  font-weight: bold;
+  line-height: 34px;
+  height: 34px;
+  margin-right: -1px;
+  margin-top: -1px;
+  padding: 0;
+  text-align: center;
+  width: 34px;
+}