CSS classes for the MultiRow control are as follows:

Class	Description
.wj-cell.wj-header	Styles the header cells including column header, row header and top left cell.
.wj-multirow .wj-hdr-collapse	Styles the collapse column header icon displayed at the right edge of the last column header cell.
.wj-multirow .wj-hdr-collapse:hover	Styles the collapse column header icon when a user hovers the mouse over it.
.wj-cell	Styles all the cells in the MultiRow control.
.wj-cell.wj-alt	Styles the alternate rows in the MultiRow control.
.wj-multirow .wj-cell.wj-record-end:not(.wj-header)	Styles the line between each record.
.wj-multirow .wj-cell.wj-group-end	Styles the line between groups.
.wj-cell:not(.wj-hasdropdown)	Styles the overflow text in cell
Selection
.wj-cells .wj-cell.wj-state-selected	Styles the currently selected cell in the MultiRow control.
.wj-cells .wj-cell.wj-state-multi-selected	Styles the currently multiple selected cell in the MultiRow control.
.wj-flexgrid .wj-marquee	Styles the Excel-style element that highlights the selection when the showMarquee property is set to true.
.wj-state-active	Styles the active cell.
.wj-cell.wj-header.wj-state-multi-selected	Styles the selected cell headers when the showSelectedHeaders or/and showSelectedHeaders property is set to true.
.wj-flexgrid .wj-colheaders .wj-header.wj-state-multi-selected	Styles the selected column headers when the showSelectedHeaders property is set to true.
.wj-flexgrid .wj-colheaders .wj-header.wj-state-multi-selected	Styles the selected row headers when the showSelectedHeaders property is set to true.
Editing
.wj-flexgrid .wj-grid-editor	Styles the cell editor element.
.wj-glyph-pencil	Styles the pencil icon displayed in the row header of the currently editing row.
.wj-glyph-asterisk	Styles the asterisk icon displayed in the row header of the new row template.
Freezing
.wj-frozen	Styles non-header frozen cells.
.wj-cell.wj-frozen-row	Styles cells in the last frozen row. This style can be used to create a horizontal divider line between the frozen and scrollable rows.
.wj-cell.wj-frozen-col	Styles cells in the last frozen column. This style can be used to create a vertical divider line between the frozen and scrollable columns.
Sorting
.wj-glyph-up	Styles the up-arrow icon displayed in the column header of a column sorted in ascending order.
.wj-glyph-down	Styles the down-arrow icon displayed in the column header of a column sorted in descending order.
Grouping
.wj-cell.wj-group	Styles the group row.
.wj-glyph-down-right	Styles the expand icon displayed in the group row for the expanded group.
.wj-glyph-right	Styles the collapse icon displayed in the group row for the collapsed group.
.wj-grouppanel	Styles the div host element for GroupPanel control.
.wj-grouppanel .wj-groupmarker	Styles the div element for each grouped column displayed in the GroupPanel control.
.wj-grouppanel .wj-groupmarker .wj-remove	Styles the (x) mark displayed in the group panel for each column header element.
.wj-glyph-drag	Styles the drag icon for each grouped column displayed in the GroupPanel control.
Filtering
.wj-glyph-filter	Styles the filter icon displayed in column headers.
.wj-filter-on	Styles the filter icon when the column has been filtered.
.wj-filter-off	Styles the filter icon when the column has not been filtered.
.wj-columnfiltereditor	Styles the div host element for FilerDialog.
.wj-valuefilter-editor	Styles the div host element for Value Filter.
.wj-conditionfilter-editor	Styles the div host element for Condition Filter.
Filtering
.wj-cell.input-validation-error	Styles the cell editor with invalid input value.
.wj-cell.wj-state-invalid	Styles the cells with invalid value.