    div.text_cell {
        width: 105ex; /* instead of 100%, */
    }

    div.input {
        width: 105ex; /* about 80 chars + buffer */
    }
    
    
    div.text_cell_render {
        /*font-family: "Helvetica Neue", Arial, Helvetica, Geneva, sans-serif;*/
        font-family: "Charis SIL", serif; /* Make non-code text serif. */
        line-height: 145%; /* added for some line spacing of text. */
        width: 105ex; /* instead of 'inherit' for shorter lines */
    }
    
    
    /* Set the size of the headers */
    div.text_cell_render h1 {
       font-size: 18pt;
    }

    
    div.text_cell_render h2 {
       font-size: 14pt;
    }
    
    
    .CodeMirror {
    font-family: Consolas, monospace;
    }