[Help Wordpress] White border around images and thumbnails

White border around images and thumbnails

Hello,

Once again, congratulations on making the best most easy to use wordpress plugin ever made.
and
I'm having an issue where a white border appears around the images and their thumbnails.
also, the images appear jumbled together an instant before initialization. I know both these issues have been tackled in other discussions but with no viable solution for a newbie like me. Not a clue of anything to do with coding. I've gotten this far in my website via curiosity, willingness to learn, and YouTube, but I don't know anything about CSS or coding.

Here's the link with the issues:
http://juangarciafinearts.com/
http://juangarciafinearts.com/photography/
http://juangarciafinearts.com/sketchbook/

Thanks so much for your time,
I'm desperate

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help.dimsemenov.com