How to use pure CSS to implement the album icon of the Apple system (code)

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Effect preview

Source code download

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

Code Interpretation

Define dom, the container contains 8 elements, each element represents a rectangular color block:

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

Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ccc;
}

Define the size of the container:

.icon {
    width: 10em;
    height: 10em;
    font-size: 30px;
    background-color: #eee;
    border-radius: 20%;
}

Draw the outline of the rectangle (the border is an auxiliary line, which will eventually be deleted), and place it in the middle and upper part of the container:

.icon {
    position: relative;
    display: flex;
    justify-content: center;
    box-sizing: border-box;
    padding: 1em;
}

.icon span {
    position: absolute;
    width: 22.5%;
    height: 37.5%;
    border: 1px dashed black;
    border-radius: 50% / 30%;
}

Set the subscript for the rectangle Variable --n:

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

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

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

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

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

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

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

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

Let the 8 rectangles rotate at fixed angles in sequence and form a circle:

.icon span {
    transform-origin: center 105%;
    transform: rotate(calc((var(--n) - 1) * 45deg));
}

Set the color variable for the rectangle- -c：

.icon span:nth-child(1) {
    --c: rgba(243, 156, 18, 0.7);
}

.icon span:nth-child(2) {
    --c: rgba(241, 196, 15, 0.7);
}

.icon span:nth-child(3) {
    --c: rgba(46, 204, 113, 0.7);
}

.icon span:nth-child(4) {
    --c: rgba(27, 188, 155, 0.7);
}

.icon span:nth-child(5) {
    --c: rgba(65, 131, 215, 0.7);
}

.icon span:nth-child(6) {
    --c: rgba(102, 51, 153, 0.7);
}

.icon span:nth-child(7) {
    --c: rgba(155, 89, 182, 0.7);
}

.icon span:nth-child(8) {
    --c: rgba(242, 38, 19, 0.7);
}

Color 8 rectangles and delete the borders that serve as auxiliary lines:

.icon span {
    /* border: 1px dashed black; */
    background-color: var(--c);
}

Set the color mixing mode so that overlapping colors can be superimposed:

.icon span {
    mix-blend-mode: multiply;
}

Add the mouse hover effect and run the animation of the rectangular color block expansion when hovering:

.icon:hover span {
    animation: rotating 2s ease-in-out forwards;
}

@keyframes rotating {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(calc((var(--n) - 1) * 45deg));
    }
}

Note that the first rectangle does not rotate during the animation because it starts from 0 degrees Go to 0 degrees. In order to make it rotate, you need to set its end angle to 360 degrees. This is achieved by modifying its subscript variable:

.icon span:nth-child(1) {
    --n: 9;
}

You're done!

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