Use less translate pc to vw

//Convert px to vw (default 100vw===390rpx)

//Declare @ function using less's function
.px-to-vw(@property, @value) {
  @vw-value: (@value / 3.9) * 1vw;
    @{property}: @vw-value;
}


.container {
  .px-to-vw(font-size, 25);
}

It's will auto translate px to vw out to page. If you page design was 390. than use  / 3.9