Mobile terminal adaptation makes px automatically converted to rem

function setRem () {
        let htmlWidth = document.documentElement.clientWidth || document.body.clientWidth; //Detect the screen width of html and body document.documentElement.style.fontSize= htmlWidth/7.5 + 'px'; //Set the font-size to 100px on a 750 screen, so that the converted rem can see at a glance how many px it was before. You can choose the screen size for development, 3.2 with a screen width of 320 is also acceptable.
      }
      setRem();
      window.onresize = function () { //Browser size changes to trigger the window.onresize function, and then trigger the function setRem()
        setRem()
      }

'postcss-pxtorem': {
  rootValue: 100, //Root element size setting, that is, HTML font-size unitPrecision: 5, //How many decimal places to keep in rem propList: ['*'], //It is a list of properties that will be converted. Here it is set to ['*'] all. If you need to set only the border, you can write ['*', '!border*']  
  selectorBlackList: ['.radius'], // is an array for filtering CSS selectors. For example, if you set it to ['fs'], then for example, the fs-xl class name, the px style will not be converted. Regular expression writing is also supported here.
  replace: true, //I really don't know what this is used for. Anyone who knows please tell me mediaQuery: false, //Not valid in media queries (like @media screen) minPixelValue: 12 //Pixels less than 12 will not be converted}