修改Extjs5.x的表格线条样式

具体颜色值请自己定义,样式如下：

/*表格线样式*/
.x-grid-with-col-lines .x-grid-cell,.x-grid-header-ct,.x-column-header{border-right: 1px solid #989898; }
.x-group-sub-header,.x-grid-row-summary .x-grid-cell-rowbody{border-top: 1px solid #989898;}
.x-grid-with-row-lines .x-grid-item,.x-grid-row-summary .x-grid-cell-rowbody {border-color: #989898; }
.x-grid-body {border-top-color: #989898; }
.x-grid-inner-locked {border-right-color: #737373;}