How to use the @patternfly/react-styles/css/utilities/Spacing/spacing.mr_0 function in @patternfly/react-styles

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="groups-example-uid-01">
              
            </button>
          
          
            <button aria-label="Setings actions" id="groups-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="simple-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="simple-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="simple-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="simple-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="default-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="default-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="default-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="default-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="expanded-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="expanded-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}

const PageToolbar = (
      
        
          
            <button aria-label="Notifications actions" id="horizontal-example-uid-01">
              
            </button>
          
          
            <button aria-label="Settings actions" id="horizontal-example-uid-02">
              
            </button>
          
        
        
          
            }
              isOpen={isKebabDropdownOpen}
              dropdownItems={kebabDropdownItems}
            /&gt;
          
          
            Kyle Baker}