html,
body {
  width: 100%;
  height: 100%;
}
#app {
  margin: 0 auto;
  max-width: 3.75rem;
  height: 100%;
  overflow: auto;
}
* {
  box-sizing: border-box;
}
body {
  font-size: 0.14rem;
}

@media screen and (min-device-width: 450px) {
  html,
  body {
    font-family: Microsoft YaHei;
  }
}