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html

<section class="nav">
  <h1>FRONT END TRENDS 2021</h1>
  <h3>Benefits of Frontend Technologies for Web</h3>
  <div class="nav-container">
    <a class="nav-tab" href="#tab-typescript">TypeScript</a>
    <a class="nav-tab" href="#tab-react">REACT</a>
    <a class="nav-tab" href="#tab-grphql">GraphQL</a>
    <a class="nav-tab" href="#tab-svelte">SVELTE</a>
    <a class="nav-tab" href="#tab-jest">JEST</a>
    <span class="nav-tab-slider"></span>
  </div>
  <canvas class="background"></canvas>
</section>

<main class="main">
  <section class="slide" id="tab-typescript">
    <h1><a href="#">TypeScript</a></h1>
    <h3>saves you time...</h3>
  </section>
  <section class="slide" id="tab-react">
    <h1><a href="#">REACT</a></h1>
    <h3>free and open-source library </h3>
  </section>
  <section class="slide" id="tab-grphql">
    <h1><a href="#">GraphQL</a></h1>
    <h3>a query language for APIs</h3>
  </section>
  <section class="slide" id="tab-svelte">
    <h1><a href="#">SVELTE</a></h1>
    <h3>cybernetically enhanced web apps</h3>
  </section>
  <section class="slide" id="tab-jest">
    <h1><a href="#">JEST</a></h1>
    <h3>testing framework</h3>
  </section>
</main>

css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-size: 16px;
}

body {
  font-family: "ROBOTO", sans-serif;
}

a {
  text-decoration: none;
}

.nav,
.slide {
  position: relative;
  z-index: 0;
  background: #1e1f26;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 0 1vw;
}
.nav h1,
.nav a,
.slide h1,
.slide a {
  font-size: 5vw;
  margin: 0 auto;
  padding-bottom: 0.5rem;
  letter-spacing: 0.4rem;
  color: #03dac6;
  transition: all 0.3s ease;
}
.nav h1:hover,
.nav a:hover,
.slide h1:hover,
.slide a:hover {
  transform: translate3d(0, -10px, 22px);
  color: #ff0266;
}
.nav h3,
.slide h3 {
  font-size: 2.7vw;
  letter-spacing: 0.2rem;
  font-family: "Josefin Sans", sans-serif;
  font-weight: 300;
  color: #faebd7;
}
.nav .nav-container,
.slide .nav-container {
  display: flex;
  flex-direction: row;
  position: absolute;
  z-index: 2;
  bottom: 0;
  width: 100%;
  height: 70px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  background: #fff;
  z-index: 10;
}
.nav .nav-container--top,
.slide .nav-container--top {
  position: fixed;
  top: 0;
}
.nav .nav-tab,
.slide .nav-tab {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  z-index: 3;
  color: #03dac6;
  letter-spacing: 0.1rem;
  font-size: 0.8rem;
}
.nav .nav-tab:hover,
.slide .nav-tab:hover {
  color: #ff0266;
  transition: all 0.5s ease;
}
.nav .nav-tab-slider,
.slide .nav-tab-slider {
  position: absolute;
  bottom: 0;
  width: 0;
  height: 6px;
  background: #03dac6;
  transition: left 0.3s ease;
}
@media (min-width: 800px) {
  .nav .nav-tab,
.slide .nav-tab {
    font-size: 2vw;
  }
  .nav .nav h1,
.nav .slide h1,
.slide .nav h1,
.slide .slide h1 {
    font-size: 3vw;
  }
  .nav .nav h3,
.nav .slide h3,
.slide .nav h3,
.slide .slide h3 {
    font-size: 2vw;
  }
}

.background {
  position: absolute;
  height: 100vh;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: -1;
}

JavaScript

var particles = Particles.init({
  selector: ".background",
  color: ["#03dac6", "#ff0266", "#000000"],
  connectParticles: true,
  responsive: [
    {
      breakpoint: 800,
      options: {
        color: "#ff0266",
        maxParticles: 43,
        connectParticles: false
      }
    }
  ]
});

class NavigationPage {
  constructor() {
    this.currentId = null;
    this.currentTab = null;
    this.tabContainerHeight = 70;
    let self = this;
    $(".nav-tab").click(function () {
      self.onTabClick(event, $(this));
    });
    $(window).scroll(() => {
      this.onScroll();
    });
    $(window).resize(() => {
      this.onResize();
    });
  }

onTabClick(event, element) {
    event.preventDefault();
    let scrollTop =
      $(element.attr("href")).offset().top - this.tabContainerHeight + 1;
    $("html, body").animate({ scrollTop: scrollTop }, 600);
  }

onScroll() {
    this.checkTabContainerPosition();
    this.findCurrentTabSelector();
  }

onResize() {
    if (this.currentId) {
      this.setSliderCss();
    }
  }

checkTabContainerPosition() {
    let offset =
      $(".nav").offset().top + $(".nav").height() - this.tabContainerHeight;
    if ($(window).scrollTop() > offset) {
      $(".nav-container").addClass("nav-container--top");
    } else {
      $(".nav-container").removeClass("nav-container--top");
    }
  }
  findCurrentTabSelector(element) {
    let newCurrentId;
    let newCurrentTab;
    let self = this;
    $(".nav-tab").each(function () {
      let id = $(this).attr("href");
      let offsetTop = $(id).offset().top - self.tabContainerHeight;
      let offsetBottom =
        $(id).offset().top + $(id).height() - self.tabContainerHeight;
      if (
        $(window).scrollTop() > offsetTop &&
        $(window).scrollTop() < offsetBottom
      ) {
        newCurrentId = id;
        newCurrentTab = $(this);
      }
    });
    if (this.currentId != newCurrentId || this.currentId === null) {
      this.currentId = newCurrentId;
      this.currentTab = newCurrentTab;
      this.setSliderCss();
    }
  }

setSliderCss() {
    let width = 0;
    let left = 0;
    if (this.currentTab) {
      width = this.currentTab.css("width");
      left = this.currentTab.offset().left;
    }
    $(".nav-tab-slider").css("width", width);
    $(".nav-tab-slider").css("left", left);
  }
}

new NavigationPage();

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