html页面多个div如何布局。在线等，谢谢啦！

html代码如下：

 <body class="hold-transition skin-blue sidebar-mini">
        <div class="wrapper">
            <div class="content-wrapper">
                <!-- Main content -->
            <section class="content">
                <div class="row" >
                    <div class="col-xs-12" >
                    <div class="box">
                            <!-- /.box-header -->
                            <div class="box-body">
                                <table id="example2" class="table table-striped  table-hover">
                                    <thead class="welcome-message">
                                        <tr><td><span style="margin-left: 32px;">欢迎您</span></td></tr>
                                        <tr>
                                            <td><img src="img/img_1.jpg" style="float: left;margin-left: 32px;margin-right: 42px;"/><span style="font-size: 12px;color:#676A6C;line-height:32px;font-weight:normal">&nbsp;&nbsp;</span>
                                            </td>
                                        </tr>
                                    </thead>
                                    <tbody id="list" class="welcome-message">


                                    </tbody>
                                    <tfoot></tfoot>

                            </table>
                            </div>

                        </div>


                    <div class="box columns" id="columns" >
                            <!-- /.box-header -->
                            <div class="box-body" style="float: ">
                                <table id="example2" class="table table-striped  table-hover">
                                    <thead class="welcome-message">
                                        <tr>
                                            <td><img src="img/i_2.jpg" style="float: left;margin-left: 32px;margin-right: 42px;"/><span style="font-size: 12px;color:#676A6C;line-height:32px;font-weight:normal">&nbsp;&nbsp;</span>
                                            </td>
                                            <td>
                                                数据动态
                                            </td>
                                        </tr>
                                    </thead>

                                    <tbody id="list" class="welcome-message">


                                    </tbody>
                                    <tfoot></tfoot>

                            </table>

                            </div>


                        </div>

                    <div class="box columns" style="">
                            <!-- /.box-header -->
                            <div class="box-body" >
                                <table id="example2" class="table table-striped  table-hover">
                                    <thead class="welcome-message">
                                        <tr>
                                            <td><img src="img/i_1.jpg" style="float: left;margin-left: 32px;margin-right: 42px;"/><span style="font-size: 12px;color:#676A6C;line-height:32px;font-weight:normal">&nbsp;&nbsp;</span>
                                            </td>
                                            <td>
                                                工作动态
                                            </td>
                                        </tr>
                                    </thead>
                                    <tbody id="list" class="welcome-message">


                                    </tbody>
                                    <tfoot></tfoot>

                            </table>
                            </div>

                        </div>


                        <div class="box columns" >
                            <!-- /.box-header -->
                            <div class="box-body" >
                                <table id="example2" class="table table-striped  table-hover">
                                    <thead class="welcome-message">
                                        <tr>
                                            <td><img src="img/i_4.jpg" style="float: left;margin-left: 32px;margin-right: 42px;"/><span style="font-size: 12px;color:#676A6C;line-height:32px;font-weight:normal">&nbsp;&nbsp;</span>
                                            </td>
                                            <td>
                                                数据播报
                                            </td>
                                        </tr>
                                    </thead>
                                    <tbody id="list" class="welcome-message">


                                    </tbody>
                                    <tfoot></tfoot>

                            </table>
                            </div>

                        </div>

                        <div class="box columns" >
                            <!-- /.box-header -->
                            <div class="box-body" >
                                <table id="example2" class="table table-striped  table-hover" >
                                    <thead class="welcome-message" >
                                        <tr>
                                            <td><img src="img/i_3.jpg" style="float: left;margin-left: 32px;margin-right: 42px;"/><span style="font-size: 12px;color:#676A6C;line-height:32px;font-weight:normal">&nbsp;&nbsp;</span>
                                            </td>
                                            <td>
                                                工作播报
                                            </td>
                                        </tr>
                                    </thead>
                                    <tbody id="list" class="welcome-message">


                                    </tbody>
                                    <tfoot></tfoot>

                            </table>
                            </div>

                        </div>

                </div>
                </div>

            </section>
            </div>
        </div>
    </body>