Question 199394 in Html Question posted in
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Html – How can I add this kind of edge to a circle? (biting effect)

I have this flex container which has three circles and I want the first one to have a bite effect on the right, the middle one normal and the last circle a bite on the left.
I tried putting another circle on top of another and just adding margin to it but it doesn’t work for the third circle. Any idea how I can do this?

.container {
  display: flex;
  flex-direction: row;
  gap: 20px;
  position: relative;
  width: 100%;
}

.box1 {
  width: 300px;
  height: 300px;
  background-color: blue;
  border-radius: 50%;
  z-index: 10;
}

.add-edge-right {
  margin-left: 250px;
  background-color: white;
}

.add-edge-left {
  margin-right: 250px;
  background-color: white;
}
<div class="container">
  <div class="box1">
    <div class="box1 add-edge-right"></div>
  </div>
  <div class="box1"></div>
  <div class="box1">
    <div class="box1 add-edge-left"></div>
  </div>
</div>

Screenshot:

Tags:

2

Answers


  1. 0

    I would suggest another way than flex.
    old school one with relative, absolute position and border
    (don’t forget the box-sizing otherwise it’s not working)

    If you want to change the size, for exemple container from 600 to 900:

    • container width 900px
    • box1 width, height 300px
    • box1:nth-child(2), several changes:
      we’ll put border to 50px, so 50 each side -> width, height 400px
      top -50px (height of the border)
    *,
*:before,
*:after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

.container {
  position: relative;
  width: 600px;
}

.box1 {
  position: absolute;
  width: 200px;
  height: 200px;
  background-color: blue;
  border-radius: 50%;
  z-index: 10;
}

.box1:first-child {
  left: 0;
}

.box1:nth-child(2) {
  width: 260px;
  height: 260px;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 11;
  border: 30px solid white;
}

.box1:last-child {
  right: 0;
}
    <div class="container">
  <div class="box1"></div>
  <div class="box1"></div>
  <div class="box1"></div>
</div>
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  2. 0

    If you want the ‘bite’ to be transparent, for example so a background shows through, then you can use CSS mask.

    In this snippet the width of the elements has been set at a CSS variable so you can easily change it if required as is the amount you want the bite ‘offset’ – to make it bigger or smaller.

    <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
  <link rel="stylesheet" href="index.css" />
  <style>
    .container {
      --w: min(300px, 30vw);
      --r: calc(var(--w) / 2);
      --x: calc(var(--w) / 3);
      /* the amount to displace the mask */
      display: flex;
      flex-direction: row;
      gap: min(20px, calc((100vw - (3 * var(--w))) / 2));
      position: relative;
      width: 100%;
    }
    
    .box1 {
      aspect-ratio: 1 / 1;
      width: var(--w);
      background-color: blue;
      border-radius: 50%;
      z-index: 10;
    }
    
    .box1:nth-child(1) {
      -webkit-mask-image: radial-gradient(circle at calc(var(--w) + var(--x)), transparent var(--r), black var(--r));
      mask-image: radial-gradient(circle at calc(var(--w) + var(--x)), transparent var(--r), black var(--r));
    }
    
    .box1:nth-child(3) {
      -webkit-mask-image: radial-gradient(circle at calc(-1 * var(--x)), transparent var(--r), black var(--r));
      mask-image: radial-gradient(circle at calc(-1 * var(--x)), transparent var(--r), black var(--r));
    }
  </style>
</head>

<body>
  <div class="container">
    <div class="box1">
    </div>
    <div class="box1"></div>
    <div class="box1"></div>
  </div>
</body>

</html>
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