How to bind the imge in hedder in html-pdf

I am using node 12 when i am generating the pdf the image is not shown in the header my sample code mentioned below

var path = require('path'); 
let hedderstr='<div id="pageHeader"><img src="./img/logo.png"  width="25" height="25"></div>'
let html="<p>welcome</p>"
var options = { format: 'A4',
"header": {
    "height": "250px",
    "contents":hedderstr 
  },
  localUrlAccess: true, 
 };
pdf.create(html, options).toFile('./sample.pdf', function(err, res) {
  if (err) return console.log(err);
  console.log(res); // { filename: '/app/businesscard.pdf' }
});```