.book {
    .book-header {
        position: fixed;
        top: 0px;
        right: 0px;
        left: 0px;
        z-index: 2;

        height: 40px;

        font-size: 0.85em;

        background: #242628;
        color: #e2edf2;
        overflow: hidden;

        .btn {
            display: block;
            height: 40px;
            padding: 0px 15px;
            border-bottom: none;
            color: #7d878a;
            text-transform: uppercase;
            line-height: 40px;

            &:hover {
                color: #e2edf2;
                text-decoration: none;
                position: relative;
                background: #303436;
                box-shadow: 0 -2px 2px rgba(0,0,0,0.2) inset;
            }
        }

        h1 {
            margin: 0px;
            font-size: 20px;
            text-align: center;
            line-height: 40px;

            padding-left: 200px;
            padding-right: 200px;
            .transition(margin-left 0.5s ease);

            a, a:hover {
                color: inherit;
                text-decoration: none;
            }

            @media (max-width: 800px) {
                display: none;
            }
        }
    }

    &.with-summary {
        .book-header h1 {
            margin-left: 250px;
        }
    }
    &.without-animation {
        .book-header h1 {
            .transition(none) !important;
        }
    }
}