.imgPresid {
    overflow: hidden;
    max-width: 100%;
    -moz-transition: all 0.5s;
    -webkit-transition: all 0.5s;
    transition: all 0.5s;
}

.imgPresid:hover {
    -moz-transform: scale(1.1);
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}