Make a perfect circle around a div of variable height

Question

I've looked into this a fair bit but can't seem to find a good, solid answer to find how to make a responsive circle around a div element of variable height.

It's easy to make a simple responsive circle using vw units.

<div style="height:20vw; width:20vw"></div>

However, I'm looking to use a min-height of an element and have a circle around this div.

Another way to create a responsive circle is using something like the snippet below, but again I can't adapt this to work for a variable height (again, I can't use vh units as the div will change in height.

.square {
  position: relative;
  width: 10%;
  background: gray;
  border-radius: 50%;
}

.square:after {
  content: "";
  display: block;
  padding-bottom: 100%;
}

.content {
  position: absolute;
  width: 100%;
  height: 100%;
}

<div class="square">
  <div class="content">

  </div>
</div>

I am trying to create something like the below, where the circle will never cut into the corners of the div (with around a 10px padding). I personally was trying to avoid javascript and would have preferred a css only approach, but it seems it's unavoidable. Maybe the only solution is to use a jquery to calculate the height of the element in order to apply this to a wrapper element?

I was playing around with this:

.square {
  position: absolute;
  top: 50%;
  display: inline-block;
  left: 50%;
  transform: translate(-50%, -50%);
  min-height: 100px;
  border-radius: 50%;
  background: url('https://i.imgur.com/2dxaFs9_d.webp?maxwidth=640&shape=thumb&fidelity=medium');
  background-size: 100% 100%;
  padding: 20px;
}

.content {
  width: 300px;
  min-height: 100px;
  background: tomato;
}

<div class="square">
  <div class="content">
    Hello!<br>
    <br><br><br>This has a variable height but fixed width<br><br><br>Hello
  </div>
</div>

Answer 1

Clip-path can easily do this if you consider solid coloration.

Resize the element and the circle will follow:

.box {
  width: 200px;
  height: 200px;
  overflow: hidden;
  resize: both;
  background: blue;
  box-shadow: 0 0 0 200vmax red;
  clip-path: circle(71%);
  margin: 100px auto;
}

<div class="box"></div>

Related question to understand the magic number 71%: clip-path:circle() radius doesn't seem to be calculated correctly

---

To use an image we can consider pseudo elements. You can also rely on calc() to add the offset:

.box {
  width: 200px;=
  resize: both;
  clip-path: circle(calc(71% + 10px));
  margin: 100px auto;
  position: relative;
  font-size:35px;
  color:#fff;
}
/* the background layer */
.box::before {
  content:"";
  position: absolute;
  z-index:-1;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:blue;
}

/* the image layer */
.box::after {
  content:"";
  position: fixed; /* to make sure the image cover all the screen */
  z-index:-2;
  top:0;
  bottom:0;
  left:0;
  right:0;
  background:url(https://picsum.photos/id/1015/1000/1000) center/cover no-repeat;
}

<div class="box" contenteditable="true"> Edit this<br>text </div>