Update style.css

style.css

@@ -2,3 +2,15 @@ h1 {
   text-align: center;
   display: block;
 }
+#duplicate-button {
+  margin: auto;
+  color: white;
+  background: #1565c0;
+  border-radius: 100vh;
+}
+
+.contain {
+  max-width: 900px;
+  margin: auto;
+  padding-top: 1.5rem;
+}