How to add offset border to image of unknown size?

Tags: css,image,border

Problem :

I'm trying to design this effect:

enter image description here

How do I make this work using css? The image size is unkown and I want the green box to be the same size as the image but offset?

I can't get any solution to work except sizing the green box using javascript but I think there must be a css solution?


Solution :

You can use pseudo-class to do this :

  border:1px solid green;
<div class="imgContainer">
  <img src="">

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