.center {
    display: block;
    margin: auto;
    padding: 10px;
    width: 98%;
    text-align: center;
}

.img-center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width:98%;
}

.img-social {
    width: 50px;
    margin-left: auto;
    margin-right: auto;
}