.profile-img-container {
    position: relative;
    display: inline-block; /* added */
    overflow: hidden; /* added */
}



.profile-img-container img:hover {
    opacity: 0.4;
}
.profile-img-container:hover a {
    opacity: 1; /* added */
    top: 0; /* added */
    z-index: 500;   
}
/* added */
.profile-img-container:hover a i {
    top: 50%;
    position: absolute;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    color:white;
}
/* added */
.profile-img-container a {
    display: block;
    position: absolute;
    top: -100%;
    opacity: 0;
    left: 0;
    bottom: 0;
    right: 0;
    text-align: center;
    color: inherit;
    cursor:pointer;
}