body {
    text-align:center;
}
h1 img {
    width: 10em;
    margin: 2em 0;
}
#Apps img {
    width: 8em;
    margin: 1em;
    -webkit-transition: width 0.5s;
            transition: width 0.5s;
}
#Apps img:hover {
    width: 9em;
}