img {
    padding:0px;
    -webkit-border-radius: 30px;
    -moz-border-radius: 30px;
    border-radius: 30px;
    -webkit-transition: all 0.4s linear;
    -moz-transition: all 0.4s linear;
    transition: all 0.4s linear;
}
img:hover {
    padding:0px;
    border-radius:0px;
}