v-flex move transition

index.vue

<template>
  <v-container grid-list-md>
    <!-- simple -->
    <div id="flip-list-demo" class="demo">
      <transition-group name="flip-list" tag="ul">
        <li v-for="item in items" :key="item">
          {{ item }}
        </li>
      </transition-group>
    </div>
    <!-- v-flex -->
    <transition-group name="cards" tag="div" class="layout row wrap">
      <v-flex v-for="item in items" :key="item" xs1>
        <v-card>
          <v-card-title>
            <h1>{{ item }}</h1>
          </v-card-title>
        </v-card>
      </v-flex>
    </transition-group>
    <!-- button -->
    <v-btn @click="shuffle">
      shuffle
    </v-btn>
  </v-container>
</template>

<script>
export default {
  data() {
    return {
      items: [1, 2, 3, 4]
    }
  },
  methods: {
    shuffle() {
      const item = this.items.pop()
      this.items.unshift(item)
    }
  }
}
</script>

<style>
.flip-list-move {
  transition: transform 1s;
}
.cards-move {
  transition: transform 1s;
}
</style>