Custom horizontal and vertical scrollbar for Bootstrap table

I'm using a bootstrap-table and have a table with large columns (horizontal scrollbar is visible). My client has the requirement of a slimmer scrollbar in the table. Here is a solution for a custom scrollbar for a bootstrap table, the problem is that it works for a vertical scrollbar, not for a horizontal one.

jsfiddle

html

 <table class="table table-striped table-bordered table-hover" cellspacing="0" id="mainTable" data-show-toggle="true" data-show-columns="true" data-pagination="true" data-show-filter="true" data-filter-control="true" >
   <thead>
      <tr>
         <th data-field="CustomerName">CustomerN</th>
         <th data-field="ProjectName">ProjectN</th>
         <th data-field="ProjectType">ProjectT</th>
         <th data-field="ProjectDetails">ProjectD</th>
         <th data-field="ProjectLocation">ProjectL</th>
         <th data-field="ProjectTiming">ProjectT</th>
         <th data-field="ProjectTeam">ProjectT</th>
         <th data-field="ProjectStatus">ProjectS</th>
         <th data-field="ProjectProgress">ProjectP</th>
      </tr>
   </thead>
   <tbody>
      <tr>
         <td>GE Capital Corporation</td>
         <td>Services SOW #1</td>
         <td>Project | T&amp;M</td>
         <td>"Inani fabulas nominavi sea no.\n"+ 
            "Ad quodsi luptatum expetenda eum, sed ludus dicam\n"+ 
            "nominati te, reque causae prompta eos ex. Putent \n"+
            "torquatos mei ei. Te verear offendit per. Vix eu erant\n"+ 
            "doctus delenit, et copiosae indoctum accommodare eum.\n"+ 
            "Errem tritani in qui, te vis legere saperet corpora.\n"+ 
            "Eu mei nobis pertinacia, in has putent virtute voluptua,\n"+ 
            "ne probo dicta utinam nam."
         </td>
         <td>Norwalk, CT</td>
         <td>Feb-Aug 2015</td>
         <td>John, Adam, Pete</td>
         <td>Running</td>
         <td>Empty</td>
      </tr>
      <tr>
         <td>GE Capital Corporation</td>
         <td>Services SOW #1</td>
         <td>Project | T&amp;M</td>
         <td>"Inani fabulas nominavi sea no.\n"+ 
            "Ad quodsi luptatum expetenda eum, sed ludus dicam\n"+ 
            "nominati te, reque causae prompta eos ex. Putent \n"+
            "torquatos mei ei. Te verear offendit per. Vix eu erant\n"+ 
            "doctus delenit, et copiosae indoctum accommodare eum.\n"+ 
            "Errem tritani in qui, te vis legere saperet corpora.\n"+ 
            "Eu mei nobis pertinacia, in has putent virtute voluptua,\n"+ 
            "ne probo dicta utinam nam."
         </td>
         <td>Norwalk, CT</td>
         <td>Feb-Aug 2015</td>
         <td>John, Adam, Pete</td>
         <td>Running</td>
         <td>Empty</td>
      </tr>
      <tr>
         <td>GE Capital Corporation</td>
         <td>Services SOW #1</td>
         <td>Project | T&amp;M</td>
         <td>"Inani fabulas nominavi sea no.\n"+ 
            "Ad quodsi luptatum expetenda eum, sed ludus dicam\n"+ 
            "nominati te, reque causae prompta eos ex. Putent \n"+
            "torquatos mei ei. Te verear offendit per. Vix eu erant\n"+ 
            "doctus delenit, et copiosae indoctum accommodare eum.\n"+ 
            "Errem tritani in qui, te vis legere saperet corpora.\n"+ 
            "Eu mei nobis pertinacia, in has putent virtute voluptua,\n"+ 
            "ne probo dicta utinam nam."
         </td>
         <td>Norwalk, CT</td>
         <td>Feb-Aug 2015</td>
         <td>John, Adam, Pete</td>
         <td>Running</td>
         <td>Empty</td>
      </tr>
   </tbody>
</table>

javascript

$('#mainTable').bootstrapTable({
});

$('.fixed-table-body').slimScroll({});

As slimScroll doesn't support horizontal scrollbars, you could use another jQuery plugin (I've used lionsbars for the snippet). But you need to do some tweaks to achieve the purpose of moving the fixed header. Use the plugin that you want but update the header scrollLeft property when you scroll on the table body, look at my example:

On Firefox MacOS the scrollbars can't be customized like in WebKit. Maybe you need to detect system capabilities and apply the plugin only on Windows.

$(function () {
  var $table = $('#table');
  buildTable($table, 50, 50);
});

function buildTable($el, cells, rows) {
  var i, j, row,
      columns = [],
      data = [],
      $header;

  for (i = 0; i < cells; i++) {
    columns.push({
      field: 'field' + i,
      title: 'Cell' + i,
      sortable: true
    });
  }
  for (i = 0; i < rows; i++) {
    row = {};
    for (j = 0; j < cells; j++) {
      row['field' + j] = 'Row-' + i + '-' + j;
    }
    data.push(row);
  }
  $el.bootstrapTable('destroy').bootstrapTable({
    columns: columns,
    data: data
  });

  $('.fixed-table-body').lionbars().find(".lb-wrap").on("scroll", function(evt){
    if (!$header) { $header = $('.fixed-table-header'); }
    $header.scrollLeft( this.scrollLeft );
  });
}

::-webkit-scrollbar {
   -webkit-appearance: none;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/js/bootstrap.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-table/1.9.1/bootstrap-table.js"></script>
<script src="https://cdn.jsdelivr.net/gh/Charuru/lionbars@master/js/jquery.lionbars.0.3.js"></script>

<link href="https://cdn.jsdelivr.net/gh/Charuru/lionbars@master/css/lionbars.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-table/1.9.1/bootstrap-table.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css" rel="stylesheet"/>

<div class="container">
  <table id="table" data-height="400" data-show-columns="true"></table>
</div>