.Modir img:hover {
    opacity: 0.6;
    border-radius: 50%;
    border: 6px solid #c3c3c3;
}

.modir img {
    display: block;
    transition: opacity 0.2s linear;
    -moz-transition: opacity 0.2s linear;
    -webkit-transition: opacity 0.2s linear;
    -o-transition: opacity 0.2s linear;
    max-width: 100%;
    border-radius: 50%;
    border: 6px solid #c3c3c3;
    margin: auto;
}