Step 1: Click the local download button on the top of the page that you want to download

Step 2: Click Download as PNG (zip)

It will now download your file to your device as a ZIP file. And you need to extract it. And if you open the file, it will be like the image with no background as shown below.

Take note, local download only downloads the page that you selected. So you will only have one page on the pdf file that you have downloaded.