fix bug

app/views/homework_commons/works_list.xlsx.axlsx

@@ -2,14 +2,14 @@
 wb = xlsx_package.workbook
 # wb.use_autowidth = false
 wb.styles do |s|
-  sz_all = s.add_style :height => 20, :border => { :style => :thin, :color =>"000000" },:alignment => {:horizontal => :center}
+  sz_all = s.add_style :border => { :style => :thin, :color =>"000000" },:alignment => {:horizontal => :center}
   blue_cell = s.add_style :bg_color => "FAEBDC", :sz => 10,:height => 20,:b => true, :border => { :style => :thin, :color =>"000000" },:alignment => {:horizontal => :center}
   wb.add_worksheet(:name => "学生成绩") do |sheet|
     sheet.sheet_view.show_grid_lines = false
     sheet.add_row table_columns, :style => blue_cell
     if task_users.count > 0
       task_users.each do |user|
-        sheet.add_row user, :style => sz_all
+        sheet.add_row user, :height => 20,:style => sz_all
       end  #each_widh_index
     end
     sheet.column_widths *([20]*sheet.column_info.count)