.ttlink {
    transition: transform 250ms;
}
.ttlink:hover {
    z-index: 1!important;
    background-color: #fff;
    transform: scale(1.1);    
}
.ttlink > a{
    text-decoration: none!important;
}

.center-img{
    display:block;
    margin:auto;
}

.img-log-50 {
    max-width: 50px;
}