go-admin-ui/src/layout/components/AppMain.vue

<template>
  <div class="app-main">
    <router-view v-slot="{ Component, route }">
      <transition name="fade-transform" mode="out-in">
        <component :is="Component" :key="route" />
      </transition>
    </router-view>
  </div>
</template>

<style lang="scss">
.app-main {
  display: flex;
}
</style>