How to use pure CSS to implement a Lego brick (source code attached)

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Source code download

https://github.com/comehope/front- end-daily-challenges

Code Interpretation

Define dom, the container contains a set of 3 faces:

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

Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, white, skyblue);
}

Define container Size:

.brick {
    width: 40em;
    height: 30em;
    font-size: 10px;
}

Draw the front side of the building block:

.brick {
    position: relative;
}

.sides .front {
    position: absolute;
    width: 9em;
    height: 6.8em;
    background-color: #237fbd;
    top: 19em;
    left: 7em;
}

Draw the right side of the building block:

.sides > * {
    position: absolute;
    background-color: #237fbd;
}

.sides .right {
    width: 18em;
    height: 6.8em;
    filter: brightness(0.8);
    top: 19em;
    left: calc(7em + 9em);
}

Draw the top side of the building block:

.sides .top {
    width: 18em;
    height: 10.4em;
    filter: brightness(1.2);
    top: calc(19em - 10.4em);
    left: calc(7em + 9em);
}

The above three faces are combined into a cube:

.sides .front {
    transform-origin: right;
    transform: skewY(30deg);
}

.sides .right {
    transform-origin: left;
    transform: skewY(-30deg);
}

.sides .top {
    transform-origin: left bottom;
    transform: rotate(-60deg) skewY(30deg);
}

Next, draw the convex particles of the building blocks.

Add 8 convex grain elements in the dom:

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

Define variables:

.studs span:nth-child(1) {
    --n: 1;
}

.studs span:nth-child(3) {
    --n: 3;
}

.studs span:nth-child(5) {
    --n: 5;
}

.studs span:nth-child(7) {
    --n: 7;
}

.studs span:nth-child(2) {
    --n: 2;
}

.studs span:nth-child(4) {
    --n: 4;
}

.studs span:nth-child(6) {
    --n: 6;
}

.studs span:nth-child(8) {
    --n: 8;
}

Draw the convex grain on the left:

.studs span:nth-child(odd) {
    top: calc(4.6em + (var(--n) - 1) / 2 * 2.6em);
    left: calc(23.3em - (var(--n) - 1) / 2 * 4.6em);
}

Draw The convex grain on the right side:

.studs span:nth-child(even) {
    top: calc(6.9em + (var(--n) - 2) / 2 * 2.6em);
    left: calc(27.9em - (var(--n) - 2) / 2 * 4.6em);
}

Finally, draw the top surface of the convex grain:

.studs span::before {
    content: '';
    position: absolute;
    width: inherit;
    height: 2em;
    background-color: #4cb7ff;
    border-radius: 50%;
}

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