rem+媒体查询---移动端 设计稿以375

@media screen and (max-width: 319px) {
  html {
    font-size: 85.33333px
  }
}

@media screen and (min-width: 320px) and (max-width: 359px) {
  html {
    font-size: 85.33333px
  }
}

@media screen and (min-width: 360px) and (max-width: 374px) {
  html {
    font-size: 96px
  }
}

@media screen and (min-width: 375px) and (max-width: 383px) {
  html {
    font-size: 100px
  }
}

@media screen and (min-width: 384px) and (max-width: 399px) {
  html {
    font-size: 102.4px
  }
}

@media screen and (min-width: 400px) and (max-width: 411px) {
  html {
    font-size: 106.66667px
  }
}

@media screen and (min-width: 412px) and (max-width: 413px) {
  html {
    font-size: 109.86667px
  }
}

@media screen and (min-width: 414px) {
  html {
    font-size: 110.4px
  }
}