On the css programming of Billing Masters

topic description

when I was compiling the css of the order master, I encountered that the picture could not come out on the browser after I wrote it.

sources of topics and their own ideas

I wonder if I made a mistake in compiling HTML5

related codes

/ / Please paste the code text below (do not replace the code with pictures)
this is its HTML:

const {app, BrowserWindow} = require("electron")
const path = require("path")
const url = require("url")
 
let win
 
function createWindow () {
  win = new BrowserWindow({width: 800, height: 600})
  win.loadURL(url.format({
    pathname: path.join(__dirname, "index.html"),
    protocol: "file:",
    slashes: true
  }))
 
  win.on("closed", () => {
    win = null
  })
}
 
app.on("ready", createWindow)
 
app.on("window-all-closed", () => {
  if (process.platform !== "darwin") {
    app.quit()
  }
})
 
app.on("activate", () => {
  if (win === null) {
    createWindow()
  }
})

what result do you expect? What is the error message actually seen?

what I expect is that the result is to see the css pictures I made up, but actually no pictures come out

Apr.11,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3e264-2c3f4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3e264-2c3f4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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