title: React DatePicker calendar showing behind table head
body: <p>I was using react datePicker and fixed-data-table-2 for my project. When I open the calendar, it shows behind table head. Here is the code for CSS file:</p>
  
  <pre><code>.ui-datepicker {
     z-index: 9999 !important;
  }
  .table{
     z-index: -1000  !important;
  }
  </code></pre>
  
  <p>Here is React Code for DatePicker：</p>
  
  <pre><code> &lt;div className='ui-datepicker'&gt;
             &lt;DatePicker
                   selected={this.state.startDate}
                   selectsStart
                   startDate={this.state.startDate}
                   endDate={this.state.endDate}
                   onChange={this.onFilterStart}
              /&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here is shortcut code for Table:</p>
  
  <pre><code>&lt;div className='table'&gt;
       &lt;Table
              rowHeight={50}
              rowsCount={tableData.getSize()}
              width={1000}
              maxHeight={1800}
              height={700}
              groupHeaderHeight={30}
              headerHeight={50}
              onColumnResizeEndCallback={this.resizeEndCallback}
              isColumnResizing={false}
              &gt;
              &lt;ColumnGroup
                  header={&lt;Cell&gt;Basic Info&lt;/Cell&gt;}&gt;
                  &lt;Column columnKey='menuTranslation'
                          header={ &lt;SortHeaderCell
                                  languageChosen={this.state.languageChosen}
                                  onSortChange={this.sortChange}
                                  sortDir={colSortDirs.foodName}&gt;Food 
                Name&lt;/SortHeaderCell&gt;}
                          isResizable={true}
                          width={columnWidths.foodName}
                          cell={&lt;MyTextCell data={tableData}  
                field='menuTranslation' col="menuTranslation"  /&gt;}
                  /&gt;
  &lt;div&gt;
  </code></pre>
  
  <p>This is the image for the problem:</p>
  
  <p><img src="https://i.stack.imgur.com/5t5m4.jpg" alt="image"></p>