#book-manager-view {
    width: 100%;
    height: 100%; 
    display: flex;
    flex-direction: row;

    #side-controls-container {
        width: 25%;
        padding-top: 16px;
    }

    .current-position {
        float: left;
        -webkit-user-select: all;  /* Chrome 49+ */
        -moz-user-select: all;     /* Firefox 43+ */
        -ms-user-select: all;      /* No support yet */
        user-select: all;          /* Likely future */  
        padding:  16px;       
    }

    .toc-container {
        width: 100%;
        text-align: center;
        padding: 16px;

        select {
            height: 40px;
            width: 100%;
        }
    }

    #exercise-actions-container {
        display: flex;
        flex-direction: column;
        
        
        .exercise-container {

            display: flex;
            flex-direction: column;
            justify-content: space-evenly;
            padding: 16px;

            .exercise-name {
                font-size: 18px;
                border-bottom: 1px solid #ddd;
            }

            button {
                display: none;
                width: 100%;
                margin-bottom: 8px;
            }
            
        }
   
    }

    @book_height: 80vh;


    #main-container {
        width: 75%;
        display: flex;
        flex-direction: row;
        align-items: stretch;
        justify-content: space-evenly;        
        height: @book_height;
        padding-top: 16px;

        .book-container {
            display: flex;
            flex-direction: column;
            
            .book-inner-container {
                position: relative;
                height: @book_height;
                overflow: auto;
                box-shadow: 0 0 4px #ccc;
                border-radius: 5px;  
            }
        }

        .page-progress-container {
            width: 100%;
            display: block;
            text-align: right;
            padding: 8px 0;
        }        
    }

    #book-viewport {
        position: absolute;
        top: 0;
        left: 0;
        width: 60vh;
        height: @book_height;
        
        padding: 0;
        position: relative;
        background: white url("https://letsdiagram.com/diagram/app/loading/loading.gif?time=1") center center no-repeat;

        .epub-view > iframe {
            background: white;

            h2 {
                font-size: 20px;
                color: black;
            }
            
            h3 {
                font-size: 18px;
                color: black;
            }
        }

      }

    .arrow-container {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 50px;
        height: @book_height;
    }


    .arrow {
        font-size: 64px;
        color: #34495e;
        font-family: arial, sans-serif;
        font-weight: bold;
        cursor: pointer;
        -webkit-user-select: none;
        -moz-user-select: none;
        user-select: none;
        text-decoration: none;
      }

      .arrow:hover, .navlink:hover {
        color: #777;
      }
      
      .arrow:active, .navlink:hover {
        color: #000;
      }


}