Update style.css

style.css

@@ -8,3 +8,41 @@ iframe {
     width: 100%;
     height: 90vh;
 }
+
+.container {
+    margin-left: auto;
+    margin-right: auto;
+    padding-left: 1rem;
+    padding-right: 1rem;
+    width: 100%
+}
+
+@media (min-width: 640px) {
+    .container {
+        max-width:640px
+    }
+}
+
+@media (min-width: 768px) {
+    .container {
+        max-width:768px
+    }
+}
+
+@media (min-width: 1024px) {
+    .container {
+        max-width:1024px
+    }
+}
+
+@media (min-width: 1280px) {
+    .container {
+        max-width:1280px
+    }
+}
+
+@media (min-width: 1536px) {
+    .container {
+        max-width:1536px
+    }
+}