fix(mobile): center component on small screens and update docs

src/style.css

@@ -62,4 +62,18 @@ p {
   padding: 3rem;
   box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
   display: inline-block;
-}
+  box-sizing: border-box;
+  max-width: 100%;
+}
+
+@media (max-width: 640px) {
+  #app {
+    padding: 1rem;
+  }
+
+  .glass-card {
+    padding: 1.5rem;
+    width: 100%;
+    border-radius: 16px;
+  }
+}