Blue Border

Hi Dr,
It is most probably the .thumbnail CSS from bootstrap ... when you hover mouse on image, the css gives a blue border to images which have a class of .thumbnail

here is how you can check the actual class of the image:
1) open the website page with image in Firefox
2) right click on the image and select INSPECT ELEMENT as in the image 1
3) check the class name as in image 2
to remove the blue border add this code on last line of your CUSTOM CSS (change .classname to the class name you find)

.classname, .classname:hover {
    border: none;
}

Select all Open in new window

IF THERE IS NO CLASS TO IMAGE, then add below class

img, img:hover {
    border: none;
}

Select all Open in new window

hope it helps.
thanks,
Prasadh