Some scrolly navbar

NavigationBar.js

import React, { Component } from 'react';
import Scrollspy from 'react-scrollspy';
import FancyName from '../components/FancyName';
import { 
  Nav,
  Navbar
} from 'react-bootstrap';



export default class NavigationBar extends Component {
  render() {
    const BGcolor = "#000";
    const NavScrollColor = "#e40909";
    const NavItemColor = "#fff";
    const NavToggleColor = "#fff";

    
    return (
<React.Fragment>
  <Scrollspy items={ ['', 'about', 'service', 'blog'] } 
    scrolledPastClassName="navbar-reduce"  
    componentTag='div' 
    className=" " 
    // currentClassName="navbar-reduce"
  >
    <Navbar 
      fixed="top" 
      collapseOnSelect 
      expand="md" 
      className="navbar navbar-b navbar-trans "
      >
      <Navbar.Brand href="/"> 
        <FancyName /> 
      </Navbar.Brand>
      <>
      <Navbar.Toggle aria-controls="responsive-navbar-nav" children>
        <span></span>
        <span></span>
        <span></span>
      </Navbar.Toggle> 
      </>
      <Navbar.Collapse id="responsive-navbar-nav" className="justify-content-end">
          <Nav className="">
            <Scrollspy items={ ['', "about"] } scrolledPastClassName="active"  componentTag='li' className=" nav-item">
                <Nav.Link  href="#about">About</Nav.Link>
              </Scrollspy>
              <Scrollspy items={ ['', "service"] } scrolledPastClassName="active"  componentTag='li' className=" nav-item">
                <Nav.Link href="#service">Experiance</Nav.Link>
              </Scrollspy>
              <Scrollspy items={ ['', "blog"] } scrolledPastClassName="active"  componentTag='li' className=" nav-item">
                <Nav.Link className="nav-link js-scroll" href="#blog">Blog</Nav.Link>
              </Scrollspy>
                <Nav.Link className="nav-link js-scroll" href="/pdf">pdf</Nav.Link>
          </Nav>
      </Navbar.Collapse>
    </Navbar> 
  </Scrollspy>

      <style global jsx>{`
      ////
      // Base Style for Nav
      ////
       .navbar-b {
        transition: all .5s ease-in-out;
        background-color: transparent;
        padding-top: 1.563rem;
        padding-bottom: 1.563rem;
      }
      
      .navbar-b.navbar-reduce {
        box-shadow: 0px 6px 9px 0px rgba(0, 0, 0, 0.06);
        transition: all .5s ease-in-out;
        background-color: ${BGcolor};
        padding-top: 15px;
        padding-bottom: 15px
      }
      
      .navbar-b.navbar-trans .nav-item,
      .navbar-b.navbar-reduce .nav-item {
        position: relative;
        padding-right: 10px;
        padding-left: 0;
      }
      
      .navbar-b.navbar-trans .nav-link,
      .navbar-b.navbar-reduce .nav-link {
        color: ${NavItemColor};
        text-transform: uppercase;
        font-weight: 600;
      }
      
      .navbar-b.navbar-trans .nav-link:before,
      .navbar-b.navbar-reduce .nav-link:before {
        content: '';
        position: absolute;
        margin-left: 0px;
        width: 0%;
        bottom: 0;
        left: 0;
        height: 2px;
        transition: all 500ms ease;
      }
      
      .navbar-b.navbar-trans .nav-link:hover,
      .navbar-b.navbar-reduce .nav-link:hover {
        color: #1B1B1B;
      }
      
      .navbar-b.navbar-trans .nav-link:hover:before,
      .navbar-b.navbar-reduce .nav-link:hover:before {
        width: 35px;
      }
      
      .navbar-b.navbar-trans .show > .nav-link:before,
      .navbar-b.navbar-trans .active > .nav-link:before,
      .navbar-b.navbar-trans .nav-link.show:before,
      .navbar-b.navbar-trans .nav-link.active:before,
      .navbar-b.navbar-reduce .show > .nav-link:before,
      .navbar-b.navbar-reduce .active > .nav-link:before,
      .navbar-b.navbar-reduce .nav-link.show:before,
      .navbar-b.navbar-reduce .nav-link.active:before {
        width: 35px;
      }
      
      .navbar-b.navbar-trans .nav-link:before {
        background-color: ${NavItemColor};
      }
      
      .navbar-b.navbar-trans .nav-link:hover {
        color: ${NavItemColor};
      }
      
      .navbar-b.navbar-trans .show > .nav-link,
      .navbar-b.navbar-trans .active > .nav-link,
      .navbar-b.navbar-trans .nav-link.show,
      .navbar-b.navbar-trans .nav-link.active {
        color: ${NavItemColor};
      }
      
      .navbar-b.navbar-reduce {
        transition: all .5s ease-in-out;
        background-color: ${BGcolor};
        padding-top: 15px;
        padding-bottom: 15px;
      }
      
      .navbar-b.navbar-reduce .nav-link {
        color: ${NavScrollColor};
      }
      
      .navbar-b.navbar-reduce .nav-link:before {
        background-color: ${NavScrollColor};
      }
      
      .navbar-b.navbar-reduce .nav-link:hover {
        color: ${NavScrollColor};
      }
      
      .navbar-b.navbar-reduce .show > .nav-link,
      .navbar-b.navbar-reduce .active > .nav-link,
      .navbar-b.navbar-reduce .nav-link.show,
      .navbar-b.navbar-reduce .nav-link.active {
        color: ${NavScrollColor};
      }
      
      .navbar-b.navbar-reduce .navbar-brand {
        color: ${NavScrollColor};
      }
      
      .navbar-b .navbar-brand {
        color: #fff;
        font-size: 1.6rem;
        font-weight: 600;
      }
      
      .navbar-b .navbar-nav .dropdown-item.show .dropdown-menu,
      .navbar-b .dropdown.show .dropdown-menu,
      .navbar-b .dropdown-btn.show .dropdown-menu {
        -webkit-transform: translate3d(0px, 0px, 0px);
        transform: translate3d(0px, 0px, 0px);
        visibility: visible !important;
      }
      
      .navbar-b .dropdown-menu {
        margin: 1.12rem 0 0;
        border-radius: 0;
      }
      
      .navbar-b .dropdown-menu .dropdown-item {
        padding: .7rem 1.7rem;
        transition: all 500ms ease;
      }
      
      .navbar-b .dropdown-menu .dropdown-item:hover {
        background-color: #0078ff;
        color: #fff;
        transition: all 500ms ease;
      }
      
      .navbar-b .dropdown-menu .dropdown-item.active {
        background-color: #0078ff;
      }
      
      /*--/ Hamburger Navbar /--*/
        .navbar-toggler span,
        .navbar-b.navbar-reduce .navbar-toggler span
        {
          background-color: ${NavToggleColor};
        }
        .navbar-toggler {
          position: relative;
        }
        
        .navbar-toggler:focus,
        .navbar-toggler:active {
          outline: 0;
        }
        
        .navbar-toggler span {
          display: block;
          height: 3px;
          width: 25px;
          margin-top: 4px;
          margin-bottom: 4px;
          -webkit-transform: rotate(0deg);
          transform: rotate(0deg);
          left: 0;
          opacity: 1;
          transition: all .35s ease-in-out;
        }
        
        .navbar-toggler span:nth-child(1),
        .navbar-toggler span:nth-child(3) {
          // transition: -webkit-transform .35s ease-in-out;
          transition: transform .35s ease-in-out, -webkit-transform .35s ease-in-out;
          transition: all .35s ease-in-out;
        }
        //////// 
        // When clicked
        ////////
        .navbar-toggler.collapsed span:nth-child(1) {
          position: absolute;
          left: 12px;
          top: 10px;
          -webkit-transform: rotate(135deg);
          transform: rotate(135deg);
          opacity: 0.9;
        }
        
        // Remove the middle
        .navbar-toggler.collapsed span:nth-child(2) {
          height: 12px;
          visibility: hidden;
          background-color: transparent;
        }
        
        .navbar-toggler.collapsed span:nth-child(3) {
          position: absolute;
          left: 12px;
          top: 10px;
          -webkit-transform: rotate(-135deg);
          transform: rotate(-135deg);
          opacity: 0.9;
      }
  `}</style>

</React.Fragment>
    )
  }
}