I\'m adding a black border on images with a blue background and while doing so, it appears to add an ever so noticeable background colored outline on the INSIDE of the borde
@stvnrynlds gave an interesting answer and I wanted to test this out myself with actual code.
I have created a snippet below with both versions for comparison.
.test1 - uses padding with a wrapper instead of a border
.test2 - uses border only
.test1{
border-radius: 50%;
width:50px;
height: 50px;
padding:5px;
background:black;
}
.test1 img{
border-radius:50%;
}
.test2 img{
border-radius: 50%;
border: 5px solid black;
}

Zooming in 500% into the browser you can see the end results:
