.sisi-pdf-flipbook-element--actions a {
    width: 100%;
    height: 38px;
    display: block;
    background: #f1f1f1;
    line-height: 38px;
    text-align: center;
    color: #000;
    margin-top: 5px;
    text-decoration: none;
}

.sisi-pdf-flipbook-element--actions a:hover {
    background: #f1f1f1;
    color: #13b5e6;
}

.sisi-pdf-flipbook-element--actions a.sisi-pdf-flipbook-element--preview-btn {
    background: #13b5e6;
    color: #fff;
}

.sisi-pdf-flipbook-element--actions a.sisi-pdf-flipbook-element--preview-btn:hover {
    background: #f1f1f1;
    color: #13b5e6;
}