Add animation

src/components/timeline/TimelineElement.scss

@@ -57,8 +57,27 @@
                     & > i > svg {
                         @apply -rotate-180;
                     }
+
+                    & ~ * {
+                        animation: toggle 0.4s ease-in-out;
+                    }
                 }
             }
         }
     }
+}
+
+@keyframes toggle {
+    0% {
+        font-size: 0;
+        opacity: 0;
+    }
+    90% {
+        font-size: 1rem;
+        opacity: 0;
+    }
+    100% {
+        font-size: 1rem;
+        opacity: 1;
+    }
 }