*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

section
{
    position: relative;
    width: 100%;
    height: 100vh;
    background-color: #001300;
    display: flex;
    flex-wrap: wrap;
    overflow: hidden;
    animation: colorChange 5s linear infinite;
}

@keyframes colorChange {
    0%{
        filter: hue-rotate(0deg);
    }
    100%{
        filter: hue-rotate(360deg);
    }
}

span
{
    position: relative;
    width: 40px;
    height: 40px;
    display: block;
}

span::before
{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: #00ff0a;
    transform: scale(.1);
    box-shadow: 0 0 10px #00ff0a;
    border-radius: 50%;
    pointer-events: none;
    transition: 2s;
}

span:hover::before
{
    transform: scale(1);
    transition: 0s;
}