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3-animation/2-css-animations/1-animate-logo-css/solution.md

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+
+CSS to animate both `width` and `height`:
+```css
+/* original class */
+
+#flyjet {
+  transition: all 3s;
+}
+
+/* JS adds .growing */
+#flyjet.growing {
+  width: 400px;
+  height: 240px;
+}
+```
+
+Please note that `transitionend` triggers two times -- once for every property. So if we don't perform an additional check then the message would show up 2 times.