Trying to add a background image to breakout game

I am trying to add a background image and my teacher was trying to explain what to do but it still wouldn't work.

<!DOCTYPE html>
<html>

<head>
  <style>
    background-image: url("https://imgur.com/sJTAxQG");
  </style>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>group project</title>
  <link href="style.css" rel="stylesheet" type="text/css" />
</head>

<body>
   <audio id="myAudio">
    <source src="8d82b5_Star_Wars_Main_Theme_Song.mp3" type="audio/mpeg">
      </audio>
  <canvas id="myCanvas" width="480" height="320"></canvas>
  <script>
   
    var canvas = document.getElementById("myCanvas");
    var ctx = canvas.getContext("2d");
    var background = new Image();
    background.onload = function(){
    background.src = 'https://imgur.com/sJTAxQG';
    ctx.drawImage(background,0,0);

Everytime I try to run it, nothing happens

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