How to use css to achieve the effect of Chinese knot (code)

The content of this article is about how to use css to achieve the effect of Chinese knot (code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Today I would like to share with you a tutorial on how to draw a Chinese knot using CSS.
The final effect is as follows:

First, we define the structure needed to draw a Chinese knot:

<div>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
</div>

Then start writing the style , let the Chinese knot be displayed in the center:

body {
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

Set the container style of the Chinese knot:

.knot {
  box-sizing: border-box;
  font-size: 100px;
  width: 2em;
  height: 1.6em;
  background: skyblue;
  display: flex;
  align-items: center;
  justify-content: center;
}

I split the basic style of the Chinese knot into 4 rectangles. First, define the basic style of the rectangle:

.box {
  position: absolute;
  box-sizing: border-box;
  width: 1em;
  height: 0.4em;
  border: var(--b) solid firebrick;
  --b: 0.1em;
}

Then we adjust the style of each rectangle and combine them into the basic shape of the knot:

.knot .box:nth-child(1) {
  transform: rotate(45deg) translate(-15%, -38%);
  border-radius: 20% 0% 0% 20% / 50% 0 0 50%;
}

.knot .box:nth-child(2) {
  transform: rotate(45deg) translate(15%, 37%);
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}

.knot .box:nth-child(3) {
  transform: rotate(-45deg) translate(15%, -38%);
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}

.knot .box:nth-child(4) {
  transform: rotate(-45deg) translate(-15%, 37%);
  border-radius: 20% 0% 0% 20% / 50% 0 0 50%;
}

Finally, we use the pseudo-elements of the first and second rectangles to draw the rest The two small circles:

.knot .box:nth-child(1)::after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  width: 0.4em;
  height: 0.4em;
  border: var(--b) solid firebrick;
  border-radius: 50% 50% 50% 0%;
  top: -0.4em;
  right: -0.4em;
}

.knot .box:nth-child(2)::after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  width: 0.4em;
  height: 0.4em;
  border: var(--b) solid firebrick;
  border-radius: 50% 0% 50% 50%;
  top: 0.2em;
  right: 0.8em;
}

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