css3 glow effect

by kuyabiye

HTML

<a class="icon" href="#"><span></span><img  width="25" src="https://cdn3.iconfinder.com/data/icons/linecons-free-vector-icons-pack/32/settings-128.png"</a>

CSS

body {
    background: #000;
    
}
.icon {
    position: relative;
    display: inline-block;   
    left: 100px;
    top: 100px;
}

.icon  span {
    display: none;
    position: absolute;
    top: -13px;
    left: -12px;
    width: 50px;
    height: 50px;
    
background: -webkit-radial-gradient(center, ellipse cover,  rgba(100,100,100,1) 0%,rgba(150,150,150,0) 70%); /* Chrome10+,Safari5.1+ */

    z-index: 2;
}

.icon:active span {
    display: block;
}

.icon img {
    
    position: relative;
    z-index: 1;
}