Lens effect - from Codrops

lens.css

.circle {
    background: rgb(255,255,255);
    border-radius: 100%;
    cursor: pointer;
    position: relative;
    margin: 0 auto;
    width: 15em; 
    height: 15em;
    overflow: hidden;
    transform: translateZ(0);
}
 
.circle h1 {
    color: rgba(189, 185, 199,0);
    font-family: 'Lato', sans-serif;
    font-weight: 900;
    font-size: 1.6em;
    line-height: 8.2em;
    text-align: center;
    text-transform: uppercase;
    -webkit-font-smoothing: antialiased;
    user-select: none;
    transition: color 0.8s ease-in-out;
}
 
.circle:before,
.circle:after {
    border-radius: 100%;
    content:"";
    position: absolute;
    top: 0; 
    left: 0;
    width: inherit; 
    height: inherit;            
    box-shadow: inset 10.6em 0 0 rgba(30, 140, 209, 0.2), 
                inset 0 10.6em 0 rgba(30, 140, 209, 0.2), 
                inset -10.6em 0 0 rgba(30, 140, 209, 0.2), 
                inset 0 -10.6em 0 rgba(30, 140, 209, 0.2);
    transition: box-shadow 0.75s;
}
 
/* We rotate the :after pseudo-element to get the edge from the corner, we could also just do that with box-shadows. */
 
.circle:after  {
    transform: rotate(45deg);
}
 
/* There is no problem using "pseudo-class + pseudo-element" :) */
 
.circle:hover:before,
.circle:hover:after  {
    box-shadow: inset 0.86em 0 0 rgba(255, 0, 0, 0.5), 
                inset 0 0.86em 0 rgba(252, 150, 0, 0.5), 
                inset -0.86em 0 0 rgba(0, 255, 0, 0.5), 
                inset 0 -0.86em 0 rgba(0, 150, 255, 0.5);
}
 
.circle:hover > h1  {
    color: rgba(185, 185, 185,1);
}

lens.html

<div class="circle">
    <h1>codrops</h1>
</div>