Example of implementing QR code scanning effects with CSS3

Online Preview

https://jsrun.pro/AafKp/

First look at the effect:

The first step is to realize the grid background:

background-image:
    linear-gradient(0deg,
    transparent 24%,
    rgba(32, 255, 77, 0.1) 25%,
    rgba(32, 255, 77, 0.1) 26%,
    transparent 27%,
    transparent 74%,
    rgba(32, 255, 77, 0.1) 75%,
    rgba(32, 255, 77, 0.1) 76%,
    transparent 77%,
    transparent),
    linear-gradient(90deg,
    transparent 24%,
    rgba(32, 255, 77, 0.1) 25%,
    rgba(32, 255, 77, 0.1) 26%,
    transparent 27%,
    transparent 74%,
    rgba(32, 255, 77, 0.1) 75%,
    rgba(32, 255, 77, 0.1) 76%,
    transparent 77%,
    transparent);
background-size: 3rem 3rem;
background-position: -1rem -1rem;

The second step realizes the scanning line and gradient background effects

background: linear-gradient(180deg, rgba(0, 255, 51, 0) 50%, #00ff33 300%);
border-bottom: 2px solid #00ff33;

Four corner effects

It is four squares of equal width and height, and you can set borders for each of them.

Set up scanning animation

@keyframes radar-beam {  
    0% {  
        transform: translateY(-110%);  
  }  
  
    100% {  
        transform: translateY(120%);  
  }  
}

Full code:

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>css3-scanner.html</title>
    <style>
    html,
    body {
        height: 100%;
        margin: 0;
    }

    .qr-scanner {
        background-image:
            linear-gradient(0deg,
            transparent 24%,
            rgba(32, 255, 77, 0.1) 25%,
            rgba(32, 255, 77, 0.1) 26%,
            transparent 27%,
            transparent 74%,
            rgba(32, 255, 77, 0.1) 75%,
            rgba(32, 255, 77, 0.1) 76%,
            transparent 77%,
            transparent),
            linear-gradient(90deg,
            transparent 24%,
            rgba(32, 255, 77, 0.1) 25%,
            rgba(32, 255, 77, 0.1) 26%,
            transparent 27%,
            transparent 74%,
            rgba(32, 255, 77, 0.1) 75%,
            rgba(32, 255, 77, 0.1) 76%,
            transparent 77%,
            transparent);
        background-size: 3rem 3rem;
        background-position: -1rem -1rem;
        width: 100%;
        height: 100%;
        position: relative;
        background-color: #111;
    }

    .qr-scanner .box {
        width: 75vw;
        height: 75vw;
        max-height: 75vh;
        max-width: 75vh;
        position: relative;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        overflow: hidden;
        border: 0.1rem solid rgba(0, 255, 51, 0.2);
    }

    .qr-scanner .line {
        height: calc(100% - 2px);
        width: 100%;
        background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
        border-bottom: 3px solid #00ff33;
        transform: translateY(-100%);
        animation: radar-beam 2s infinite;
        animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
        animation-delay: 1.4s;
    }

    .qr-scanner .box:after,
    .qr-scanner .box:before,
    .qr-scanner .angle:after,
    .qr-scanner .angle:before {
        content: '';
        display: block;
        position: absolute;
        width: 3vw;
        height: 3vw;

        border: 0.2rem solid transparent;
    }

    .qr-scanner .box:after,
    .qr-scanner .box:before {
        top: 0;
        border-top-color: #00ff33;
    }

    .qr-scanner .angle:after,
    .qr-scanner .angle:before {
        bottom: 0;
        border-bottom-color: #00ff33;
    }

    .qr-scanner .box:before,
    .qr-scanner .angle:before {
        left: 0;
        border-left-color: #00ff33;
    }

    .qr-scanner .box:after,
    .qr-scanner .angle:after {
        right: 0;
        border-right-color: #00ff33;
    }

    @keyframes radar-beam {
        0% {
            transform: translateY(-100%);
        }

        100% {
            transform: translateY(0);
        }
    }
    </style>
</head>

<body>
    <div class="qr-scanner">
        <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
        </div>
    </div>
</body>
</html>

The above is the details of the example of using CSS3 to implement QR code scanning special effects. For more information about CSS3 QR code scanning special effects, please pay attention to other related articles on 123WORDPRESS.COM!

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