train-school/src/App.vue

<template>
  <div id="app">
    <router-view />
  </div>
</template>
<script>
export default {
  name: 'App',
  components: {},
};
</script>

<style lang="less">
html {
  body {
    margin: 0;
    padding: 0;
  }
  margin: 0;
  padding: 0;
  p {
    margin: 0;
    padding: 0;
  }
}
</style>