When I try to view the mobile version of this table, I don't get the horizontal scroll bar. What should I do to view the scroll bar or make it responsive? I already tried to add:

  

https://www.lightningdesignsystem.com/components/lookups/#Grouped

    

        

            <button class="slds-button slds-button_icon slds-modal__close slds-button_icon-inverse">
                <svg class="slds-button__icon slds-button__icon_large" aria-hidden="true">
                    
                </svg>
                Cancel and close
            </button>
            

                
Account name

            

            

                

                    

                        Accounts
                        

                            <svg class="slds-icon slds-input__icon slds-icon-text-default" aria-hidden="true">
                                
                            </svg>
                            <input type="text" id="lookup" class="slds-input" role="combobox" aria-activedescendant=""
                                aria-autocomplete="list" aria-controls="lookup-grouped-table-id-1"
                                aria-haspopup="listbox" aria-expanded="true" />
                        

                    

                  

                   

                                            role="listbox" id="lookup-grouped-table-id-1"
                        aria-label="Example table for advanced modal lookup">
                        
                            
                                
                            
                            
                                
                                
                                
                                
                            
                        
                        
                            
                                
                                
                                
                                
                            
                            
                                
                                
                                
                                
                            
                            
                                
                                
                                
                                
                            
                            
                                
                                
                                
                                
                            
                            
                                
                                
                                
                                
                            
                        
                    

                                    

                                        <button
                                            class="slds-button slds-button_icon slds-button_icon slds-button_icon-x-small"
                                            title="Filter List">
                                            <svg class="slds-button__icon" aria-hidden="true">
                                                                                                    xlink:href="/assets/icons/utility-sprite/svg/symbols.svg#filterList">
                                                
                                            </svg>
                                            Filter List
                                        </button>
                                        <button
                                            class="slds-button slds-button_icon slds-button_icon slds-button_icon-x-small"
                                            title="Sort">
                                            <svg class="slds-button__icon" aria-hidden="true">
                                                
                                                
                                            </svg>
                                            Sort
                                        </button>
                                    
5 Results, sorted by relevance
                                

                                    
Account Name

                                

                                    
Location

                                

                                    
Secondary Column

                                

                                    
Tertiary Column

                                

                                    
                                        

                                            <svg class="slds-icon slds-icon-standard-account slds-icon_small slds-m-right_x-small"
                                                aria-hidden="true">
                                                
                                                
                                            </svg>Acme Landscape
                                        

                                    
                                

                                    
Seattle, WA

                                

                                    
Secondary Field

                                

                                    
Tertiary Field

                                

                                    
                                        

                                            <svg class="slds-icon slds-icon-standard-account slds-icon_small slds-m-right_x-small"
                                                aria-hidden="true">
                                                
                                                
                                            </svg>ACME Construction
                                        

                                    
                                

                                    
San Francisco, CA

                                

                                    
Secondary Field

                                

                                    
Tertiary Field

                                

                                    
                                        

                                            <svg class="slds-icon slds-icon-standard-account slds-icon_small slds-m-right_x-small"
                                                aria-hidden="true">
                                                
                                                
                                            </svg>Action Sports
                                        

                                    
                                

                                    
Madison, WI

                                

                                    
Secondary Field

                                

                                    
Tertiary Field

                                

                                    
                                        

                                            <svg class="slds-icon slds-icon-standard-account slds-icon_small slds-m-right_x-small"
                                                aria-hidden="true">
                                                
                                                
                                            </svg>Moderno Bistro
                                        

                                    
                                

                                    
Acton, OH

                                

                                    
Secondary Field

                                

                                    
Tertiary Field

                                

                                    
                                        

                                            <svg class="slds-icon slds-icon-standard-account slds-icon_small slds-m-right_x-small"
                                                aria-hidden="true">
                                                
                                                
                                            </svg>Cozy Kitchen
                                        

                                    
                                

                                    
Acton, CA

                                

                                    
Secondary Field

                                

                                    
Tertiary Field

                                

                

            

            

                <button class="slds-button slds-button_neutral" aria-label="Cancel and close">Cancel</button>
                <button class="slds-button slds-button_neutral">New Account</button>