Glowing Progress Bar

<!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>Glowing Loading Bar</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body { background-color: #292929; }

        section {
            width: 100%;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        ul#loader {
            width: 450px;
            list-style: none;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        ul#loader li {
            width: calc(100% / 5);
            height: 6px;
            background-color: rgba(255,255,255,0);
            box-shadow: inset 0 0 10px 1px rgba(117,182,255,0.4),
                            0 0 20px rgba(117,182,255,0.1);

            animation: loading 2s steps(6) infinite;
            animation-delay: calc(2s * var(--i));
        }

        @keyframes loading {
            0%, 100% {
                background-color: rgba(255,255,255,0);
                box-shadow: inset 0 0 10px 1px rgba(117,182,255,0.4),
                            0 0 20px rgba(117,182,255,0.1);
            }

            50% {
                background-color: rgba(255,255,255,1);
                box-shadow: inset 0 0 10px 1px rgba(117,182,255,0.5),
                            0 0 20px rgba(117,182,255,1);
            }
        }
        
    </style>
</head>
<body>
    <section>
       <ul id="loader">
            <li style="--i:0"></li>
            <li style="--i:1"></li>
            <li style="--i:2"></li>
            <li style="--i:3"></li>
            <li style="--i:4"></li>
       </ul>
    </section>
</body>
</html>
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Result Screenshot(s)

Glowing Progress BarWorking Sample0