The <Transition> component automatically gives us 6 different CSS classes we can use to animate an
element.
Fill the blanks so that the 3 first class names are completed, in the correct order, for when an element
becomes visible:
1. v-enter-@(6)
2. v-enter-@(6)
3. v-enter-@(6)
1. v-enter-from
2. v-enter-active
3. v-enter-to