his-answer/src/pages/404.vue

<template>
  <div class="container-404">
    <div class="container-404-body">
      <span>404</span>
      <p @click="$router.back()">&lt; 点击返回上一页</p>
    </div>
  </div>
</template>

<script>

</script>

<style lang="scss" scoped>
  .container-404 {
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    .container-404-body {
      span {
        font-size: 56px;
        font-weight: 700;
      }
      p {
        text-align: center;
        color: #666;
        font-size: 14px;
        &:active {
          opacity: 0.6;
        }
      }
    }
  }
</style>