HTML code for image to fit screen [smartphone particularly]

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I need something very simple. We are using QR codes. I wan to post images on a webpage. Here is the image:

I need the index page so that on a mobile device the width is 100%. I can not figure it out for some reason. Should be a piece of cake for someone else. The end result should look like the attachment.

Really looking to spend $20 on this.

Thank you.

Skills required:
HTML, Website Design
Additional Files: +full+screen.gif
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$ 30
in 0 days