How to remove border from Inserted Images

I have 3 images inserted into the Homepage Content Area of my website. However, when I view the homepage in Chrome or IE I can see an additional 'border' around the images. I have tried changing the image border variable to '0' but it doesn't help.
You can see the 3 images (first place, second place, third place) near the bottom of the home page here: selfdirectedgoldiraplan(dot)com

Any help appreciated in removing the border would be most appreciated. Thanks.

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.index-content img {
border: none;
}

 

That works perfectly. Thank You.