HTML+CSS: Blinking Rhombus

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blinking_rhombus

index.html

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<!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>菱形加载动画</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="loading">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>
</html>

style.css

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body{
    margin: 0;
    padding: 0;
    height: 100vh;
    /*place the content at the center, set body as flex container, thus the div element is the flex item*/
    display: flex;
    justify-content: center;
    align-items: center;
    background:  linear-gradient(200deg,#f4efef,#e3eeff);
}

.loading{
    width: 200px;
    height: 200px;
    /* grid display */
    display: grid;
    /* set the grid to be three columns per row */
    grid-template-columns: repeat(3,1fr);
    /* set the gap between grid items: both horizontally and vertically gap */
    gap: 10px;
    /* number the items for later use: nth-child() */
    /* counter-reset: number; */
    /* ctrl + shift / */
    /* rotate by 45 degrees */
    transform: rotate(45deg);
}

.loading span{
    /* user-defined property: grammar is `--` followed by name */
    --c:red;
    background-color: var(--c);
    position: relative;
    transform: rotate(0);
    /* animation  name  duration   easing function  repeat */
    animation: blinking  2s linear infinite;
    /* wait for a few sec */
    animation-delay: var(--d);
}

.loading span::before{
    /* setting increasing number */
    /* counter-increment: number; */
    /*  */
    /* content:counter(number); */
    color: #fff;
    position: absolute;
    width: 100%;
    height: 100%;
}

.loading span:nth-child(7){
    --c:#f15a5a;
    --d:0s;
}

.loading span:nth-child(4),
.loading span:nth-child(8){
    --c:#f0c419;
    --d:0.2s;
}

.loading span:nth-child(1),
.loading span:nth-child(5),
.loading span:nth-child(9){
    --c:#4eba6f;
    --d:0.4s;
}

.loading span:nth-child(2),
.loading span:nth-child(6){
    --c:#2d95bf;
    --d:0.6s;
}

.loading span:nth-child(3){
    --c:#955ba5;
    --d:0.8s;
}

@keyframes blinking {
    0%,100%{
        /* scale(x,y) suggests the change in width and height*/
        transform: scale(0);
    }
    40%,80%{
        transform: scale(1);
    }
}