style.css

body {
    background: #1E3266;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

div {
    display: flex;
}

a {
    margin: 0 10px;
    border-radius: 50%;
    box-sizing: border-box;
    background: none;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;

    text-decoration: none;
    transition: 0.7s;
    font-size: 2.5em;
    color: var(--color);
}
    /*-webkit-box-reflect: below 5px linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
*/
    a:hover {
        background: var(--color);
        color: #050801;
        box-shadow:
            0 0 5px var(--color),
            0 0 25px var(--color),
            0 0 50px var(--color),
            0 0 200px var(--color);
    }