@Override
    protected void setContentCellStyle(CellWriteHandlerContext context) {
        if (context.getFirstCellData() == null) {
            return;
        }
        WriteCellData<?> cellData = context.getFirstCellData();
        WriteCellStyle.merge(contentCellStyle(context), cellData.getOrCreateStyle());
    }
Use the same style for the column

@author Jiaju Zhuang
fastexcel-core/src/main/java/cn/idev/excel/write/style/AbstractVerticalCellStyleStrategy.java