在边界半径图像背景上添加边框渗透

Question

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 border when doing so. Is there a way to get rid of this? The code I'm using is simple:

border-radius: 100%;
border: 3px solid rgb(0, 0, 0);

And you can see the background color edging in by adding a radius to any image, as an example:

Answer 1

There are several ways to avoid that annoying border-radius background bleed:

Method 1: Wrapper with Background Color

Put the <img> in a wrapper element, and add padding to the wrapper, with a background color that matches the <img> 's border. This way, any antialiasing that happens on the image will take into account the background color of the wrapper, rather than the background color of the page.

Method 2: Add Background Color to Image

Add a background color to your <img> that matches the border color. It'll use the <img> 's background color instead of the page background color to do the antialiasing.

Method 3: Use Padding Instead

Don't bother with a border. Add padding to your <img> equal to the border size you want, and add a background color in the border color you want. This gets you the same effect with the least amount of code.

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Here's a JSFiddle with each of these methods: https://jsfiddle.net/4zpL98au/14/

Answer 2

@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; } 

 <div class="test1"><img src="http://i.imgur.com/4LM6DpN.gif"/></div> <div class="test2"><img src="http://i.imgur.com/4LM6DpN.gif"/></div> 

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

Answer 3

There's a quite simple solution for this problemen, just by adding a background color:

background:#000;
border-radius: 100%;
border: 3px solid #000;