refactor

src/App.css

@@ -1,38 +1,20 @@
-.App {
+.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;
 }
 
-.App-logo {
-  height: 40vmin;
-  pointer-events: none;
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  .App-logo {
-    animation: App-logo-spin infinite 20s linear;
-  }
-}
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
-}
-
-.App-link {
-  color: #61dafb;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
+.board-row:after {
+  clear: both;
+  content: '';
+  display: table;
 }

src/index.css

@@ -10,25 +10,4 @@ body {
 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;
-}
-
-.board-row:after {
-  clear: both;
-  content: '';
-  display: table;
 }