1.使用vw,vh,rem

@function vw($px) {
  @return ($px / 1920) * 100vw;
}

@function vh($px) {
  @return ($px / 1075) * 100vh;
}

@function rem($px) {
  @return ($px / 100) * 1rem;
}

2.媒体查询

@media (max-width: 860px){
  .choose-button {
    position: relative;
    width: 100%;
    margin-bottom: 0;
    .px2rem(height, 92);
  }
}

.px2rem(@name, @px) {
  @{name}: @px / 75 * 1rem;
}