.btn-clear {
    outline: none;
    border: 0;
    box-shadow: none;
    background-color: transparent;
}

.img-small {
    width: auto;
    height: 50px;
}

.img-cb {
    width: auto;
    height: 15px;
}

.centered-div {
    max-width: 560px; /* you have to have a size or this method doesn't work */
    max-height: 315px;
    margin-right: auto;
    margin-left: auto;
}