.btn.btn-primary.buy1click.book-item-cart {
    padding: 0;
}

.book-item .subsc_but_wrap {
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    margin: 0 auto;
    z-index: 11;
}
.book-item .subsc_but_wrap .btn{
    width: 160px !important;
}
.book-item .subsc_but_wrap .btn span{
    font-size:10px;
}