.mt {
    margin-top: 1em;
    display: block;
}

.app-link {
    display: block;
    background: white;
    border-radius: 5px;
    width: 100px;
    height: 100px;
    box-shadow: 1px 1px 3px #ccc;
    color: #333;
    text-decoration: none;
    text-align: center;
    padding-top: 30px;
}

.app-link:hover {
    background-color: #abdbdb;
    box-shadow: 1px 1px 3px #aaa;
    text-shadow: 1px 1px white;
}