padding: .5rem 1rem;
    margin: .8rem 0;
    color: #7a7a7a;
    border-left: .25rem solid #e5e5e5;
}

blockquote p:first-child {
    margin-top: 0;
}

blockquote p:last-child {
    margin-bottom: 0;
}

@media (min-width: 30em) {
    blockquote {
        padding-right: 5rem;
        padding-left: 1.25rem;
    }
}

/* layout */
.container, .appendix, .book, .chapter, .footer {

    padding: 0
}

.sidebar .directory .card-header div {
    padding: .75em 1.25em
}

@media (min-width: 992px) {
    .sidebar .directory .card-body {
        padding-left: 1.25rem;
        padding-right: 1.25rem
    }

    .sidebar .directory li {
        font-size: 100%
    }

    .sidebar .directory ul {
        padding-left: 1em
    }
}

.tree-toggle {