html,
body,
div {
    margin: 0;
    padding: 0;
    height: 100%;
    text-align: center;
}

#logo img {
    width: 360px;
    height: 360px;
    border-radius: 20px;
    transition: all 300ms;
    -webkit-transition: all 300ms;
    -moz-transition: all 300ms;
    -o-transition: all 300ms;
}

#logo img:hover {
    transform: scale(1.1);
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    -o-transform: scale(1.1);
    box-shadow: 0 10px 10px rgba(0, 0, 0, 0.3);
}