用HTML 和 CSS3 做一个雷达扫描

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <style>
    body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, silver, black);
}
.radar {
    width: 8em;
    height: 8em;
    font-size: 32px;
    background: 
        linear-gradient(black, black);
}
.radar {
    background: 
            repeating-radial-gradient(
                transparent 0, 
                transparent 0.95em, 
                darkgreen 0.95em, 
                darkgreen 1em),
            linear-gradient(black, black);}
            .radar {
                  background: 
            linear-gradient(
                90deg,
                transparent 49.75%,
                darkgreen 49.75%,
                darkgreen 50.25%,
                transparent 50.25%),
            linear-gradient(
                transparent 49.75%,
                darkgreen 49.75%,
                darkgreen 50.25%,
                transparent 50.25%),
            repeating-radial-gradient(
                transparent 0, 
                transparent 0.95em, 
                darkgreen 0.95em, 
                darkgreen 1em),
            linear-gradient(black, black);}
            .radar {
    position: relative;
}

.radar::before {
    content: '';
    position: absolute;
    width: calc(8em / 2);
    height: calc(8em / 2);
}
.radar::before {
    background: linear-gradient(
            45deg,
            rgba(0, 0, 0, 0) 50%,
            rgba(0, 192, 0, 1) 100%
        );
    border-radius: 100% 0 0 0;}
    .radar {
    border-radius: 50%;
}
.radar {
    width: calc(8em + 1.5em);
    height: calc(8em + 1.5em);
}

.radar::before {
    top: calc(1.5em / 2);
    left: calc(1.5em / 2);
}
.radar::before {
    animation: scanning 5s linear infinite;
    transform-origin: 100% 100%;
}

@keyframes scanning {
    to {
        transform: rotate(360deg);
    }
}




    </style>
</head>
<body>
        <div class="radar"></div>
</body>
</html>
用HTML 和 CSS3 做一个雷达扫描

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