/* SF CSS */
.arrow {
    padding: 4rem 4rem;
}
.book {
    position:relative;
    display:inline-block;
}
.book-badge{
    position: absolute;
    right:10px;
    bottom:10px;
}

.jumbotron {
    padding: 2rem 1rem;
    margin-bottom: 2rem;
    background-color: #e9ecef;
    border-radius: .3rem;
}

.centered {
    text-align: center;
}

.copyright {
    background-color: rgba(52, 58, 64, 0.9);
}