BEAUMONT and NEVINS template. How to add a thin frame to gallery thumbnails?

HELP!

Any super smart tech person know how to add border on image block?

I tried many CSS suggestions, but only x3 lines of border/frame appear on the image block. Obviously, I need x4 lines around the image block.  For weeks, I have been asking for help via squarespace, facebook and reddit forums, but still, no answer/solution. Support will be greatly appreciated! Thanks for reading! 

See image attached below. Avenue and Nevins template.

2 minutes ago, Beaumont said:

HELP!

Any super smart tech person know how to add border on image block?

I tried many CSS suggestions, but only x3 lines of border/frame appear on the image block. Obviously, I need x4 lines around the image block.  For weeks, I have been asking for help via squarespace, facebook and reddit forums, but still, no answer/solution. Support will be greatly appreciated! Thanks for reading! 

See image attached below. Avenue and Nevins template.

Can you share your site with the protected password to check your issue?

No password.

Alternative method to help?

Know how to create border/frame on image blocks for page content?

CSS I am trying, only creates x3 lines on the image block? See screen shots below.

Need x4 lines on image block.

Thank you for reading.

8 hours ago, Beaumont said:

No password.

Alternative method to help?

Know how to create border/frame on image blocks for page content?

CSS I am trying, only creates x3 lines on the image block? See screen shots below.

Need x4 lines on image block.

Thank you for reading.

Try

img {
	width: 100% !important;
	height: auto !important;
	left: 0 !important;
	top: 0 !important;
	border: 3px solid white;
}

Thanks tuanphan. Will try this CSS and let you know.

Appreciate you trying to help.