Fixed the issue: Background Color in Different Browsers

My wife is the graphic designer. 2 days ago, she told me to take a look at her company website after she updated it.

The interesting part was that when I used chrome to view it, the color was fluorescent green as follows: 

When she used iPhone 5 to view it, it was the same as above.

When she used IE9 and Safari, the color is lime green and it is the expected result.  

I talked to her: is this image a JPG file when you design it in Adobe Photoshop? She said: Yes.

After looking into this issue, she changed JPG to PNG and updated the site.  It works the same in different browsers.