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HTML

<!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>Tab Bar Menu Indiactor</title>
    <link href='https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css' rel='stylesheet'>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="nav">
        <ul class="nav_links">
            <li class="nav_link">
                <a href="#"><i class="bx bx-home-alt-2"></i></a>
            </li>
            <li class="nav_link">
                <a href="#"><i class="bx bx-heart"></i></a>
            </li>
            <li class="nav_link">
                <a href="#"><i class="bx bx-plus-circle"></i></a>
            </li>
            <li class="nav_link">
                <a href="#"><i class="bx bx-user"></i></a>
            </li>
            <li class="nav_link">
                <a href="#"><i class="bx bx-bell"></i></a>
            </li>
            <div class="nav_light"></div>
        </ul>
    </div>
    
    <script src="script.js"></script>
</body>
</html>

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    list-style: none;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

li {
    display: inline-block;
}

.nav{
    background-color: #191919;
    width: 30em;
    height: 8em;
    border-radius: 20px;
    padding: 0 2em;
    box-shadow: 0 1em 1em rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.nav_links {
    width: 100%;
    display: flex;
    justify-content: space-between;
}

.nav_links a {
    color: #fff;
    font-size: 2.5em;
    opacity: 0.5;
    cursor: pointer;
}

.nav_light {
    position: absolute;
    top: 0;
    left: 1.3em;
    background-color: #fff;
    width: 4em;
    height: 0.4em;
    border-radius: 2px;
    display: flex;
    justify-content: center;
    transition: 0.3s;
}

.nav_light::before{
    content: "";
    width: 5em;
    height: 7em;
    position: absolute;
    top: 0.4em;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.3) -50%,
    rgba(255, 255, 255, 0) 90%);
    clip-path: polygon(30% 0, 70% 0, 100% 100%, 0% 100%);
}

.nav_link.active a {
    opacity: 1;
}

.nav_link.active a .bx-home-alt-2 {
    color: #00f7ff;
    text-shadow: 0 0 15px #00f7ff,
    0 0 30px #00f7ff,
    0 0 45px #00f7ff,
    0 0 60px #00f7ff;
}

.nav_link:nth-child(1).active~.nav_light {
    background-color: #00f7ff;
}

.nav_link.active a .bx-heart {
    color: #ff0000;
    text-shadow: 0 0 15px #ff0000,
    0 0 30px #ff0000,
    0 0 45px #ff0000,
    0 0 60px #ff0000;
}

.nav_link:nth-child(2).active~.nav_light {
    background-color: #ff0000;
}

.nav_link.active a .bx-plus-circle {
    color: #adff2f;
    text-shadow: 0 0 15px #adff2f,
    0 0 30px #adff2f,
    0 0 45px #adff2f,
    0 0 60px #adff2f;
}

.nav_link:nth-child(3).active~.nav_light {
    background-color: #adff2f;
}

.nav_link.active a .bx-user {
    color: #f707f7;
    text-shadow: 0 0 15px #f707f7,
    0 0 30px #f707f7,
    0 0 45px #f707f7,
    0 0 60px #f707f7;
}

.nav_link:nth-child(4).active~.nav_light {
    background-color: #f707f7;
}

.nav_link.active a .bx-bell {
    color: #eeff00;
    text-shadow: 0 0 15px #eeff00,
    0 0 30px #eeff00,
    0 0 45px #eeff00,
    0 0 60px #eeff00;
}

.nav_link:nth-child(5).active~.nav_light {
    background-color: #eeff00;
}