add tower builing game

public/game2048/style/main.css

@@ -12,6 +12,10 @@ body {
 
 body {
   /* margin: 80px 0; */
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
 }
 
 .heading:after {
@@ -144,8 +148,10 @@ hr {
 }
 
 .container {
-  width: 500px;
+  width: calc(100% - 16px);
+  max-width: 500px;
   margin: 0 auto;
+  padding: 0 8px;
 }
 
 @-webkit-keyframes fade-in {
@@ -683,8 +689,10 @@ hr {
   }
 
   .container {
-    width: 280px;
+    width: calc(100% - 16px);
+    max-width: 280px;
     margin: 0 auto;
+    padding: 0 8px;
   }
 
   .score-container,