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CSS

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HTML 

              
                <section id="main">
    <!--Navigation-->
    <nav>
      <div class="logo">
        <a href="#">LOGO</a>
      </div>
      <input class="menu-btn" type="checkbox" id="menu-btn" />
      <label class="menu-icon" for="menu-btn">
        <span class="nav-icon"></span>
      </label>
      <!--Navigation-->
      <ul class="menu">
        <li><a href="#main">Home</a></li>
        <li><a href="#">Blog</a></li>
        <li><a href="#">Services</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>

    <div class="main-text">
      <p>Hello!</p>
      <p>
        This page has a custom scrollbar<br>
        Keep scrolling down
      </p>
      <a href="#" class="btn-primary">Just a Button</a>
    </div>
    <img src="https://omjsblog.wordpress.com/wp-content/uploads/2024/05/untitled-design6.png" class="rocket" alt="Rocket" />
  </section>
  <!--About Me-->
  <div class="about reveal fade-bottom">
    <div class="about-text">
      <h2>What's a Scrollbar?</h2>
      <p>
        A long thin section at the edge of a computer display by which material can be scrolled using a mouse.
      </p>
      <p>
        By styling the scrollbar, you can create a more visually appealing site that better aligns with your brand or
        design.
      </p>
    </div>
  </div>
!

CSS 

              
                @charset "utf=8";
@import url("https://fonts.googleapis.com/css2?family=Poppins&display=swap");

body {
  margin: 0px;
  padding: 0px;
  font-family: "Poppins", sans-serif;
  background-color: #301934;
}
* {
  box-sizing: border-box;
  scroll-behavior: smooth;
}
@supports not selector(::-webkit-scrollbar) {
  * {
    scrollbar-width: auto;
    scrollbar-color: #553c9a #301934;
  }
}
::-webkit-scrollbar {
  width: 13px;
}
::-webkit-scrollbar-thumb {
  background: rgba(85, 60, 154, 0.3);
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
::-webkit-scrollbar-track {
  background-color: #301934;
}
::-webkit-scrollbar-button{
  background-color: #301934;
  background-repeat: no-repeat;   
  background-size: 100%;
  background-position: center;
 }
::-webkit-scrollbar-button:decrement {
  background-image: url("https://omjsblog.wordpress.com/wp-content/uploads/2024/05/rocket-up.png");   
 }
::-webkit-scrollbar-button:increment {
  background-image: url("https://omjsblog.wordpress.com/wp-content/uploads/2024/05/rocket-down.png"); 
}
ul {
  list-style: none;
}
a {
  text-decoration: none;
}
nav {
  display: inline-flex;
  justify-content: space-around;
  align-items: center;
  height: 60px;
  position: fixed;
  width: 100%;
  background: rgba(85, 60, 154, 0.1);
  backdrop-filter: blur(15px);
  /* -webkit-backdrop-filter: blur(15px); */
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0px 5%;
  z-index: 1;
}
.logo a {
  font-weight: 700;
  color: #b393d3;
  font-size: 2rem;
  letter-spacing: 0.5px;
}
nav ul {
  display: flex;
}
nav ul li a {
  height: 40px;
  line-height: 43px;
  margin: 10px;
  padding: 0px 30px;
  display: flex;
  font-size: 1rem;
  font-weight: 500;
  color: #b393d3;
  transition: 0.1s;
}
nav ul li a:hover {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  color: #fff;
  text-shadow: 0px 0px 10px #fff, 0px 0px 10px #553c9a, 0px 0px 20px #553c9a,
    0px 0px 40px #553c9a, 0px 0px 80px #fff;
}
#main {
  background-color: #301934;
  width: 100%;
  height: 100vh;
  position: relative;
}
.main-text p:nth-child(1) {
  font-weight: 500;
  font-size: 27px;
  line-height: 1px;
}
.main-text p:nth-child(2) {
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.main-text p:nth-child(3) {
  font-size: 20px;
  font-weight: 500;
  color: #fff;
}
.main-text {
  position: absolute;
  left: 20%;
  top: 50%;
  transform: translate(-13%, -42%);
  z-index: 1;
}
.main-text p {
  color: #b393d3;
  margin: 23px 0px 25px;
  line-height: 58px;
}
.main-text p a {
  color: #553c9a;
  padding: 0;
}
.main-text a,
.about a {
  width: 150px;
  height: 42px;
  outline: none;
  margin: 0px;
  padding: 0.8rem;
  border-radius: 7px;
  font-size: 17px;
  font-weight: 200;
}
.btn {
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #b393d3;
}
.btn-primary {
  background: rgba(0, 194, 203, 0.05);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #553c9a;
}
.btn:hover,
.btn-primary:hover {
  color: #ffffff;
  text-shadow: 0px 0px 10px #fff, 0px 0px 10px #553c9a, 0px 0px 20px #553c9a,
    0px 0px 40px #553c9a, 0px 0px 80px #fff;
}
.rocket {
  height: 560px;
  position: absolute;
  bottom: 0px;
  left: 80%;
  transform: translateX(-70%);
  filter: grayscale(30%);
}
.about {
  width: 75%;
  height: 350px;
  background-color: #301934;
  border-radius: 20px;
  box-shadow: 2px 2px 12px rgba(0, 0, 0, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  margin: -3% auto 20px auto;
  position: relative;
  justify-content: space-evenly;
  align-items: center;
}
.about-text {
  color: #e0ffff;
  width: 800px;
  text-align: center;
}
.about-text h2 {
  color: #b393d3;
  font-weight: 600;
  font-size: 30px;
  line-height: 0px;
  padding-bottom: 1rem;
}
.about-text p {
  font-size: 17px;
  padding-bottom: 0.5rem;
}
nav .menu-btn {
  display: none;
}
.reveal {
  opacity: 0;
}

.reveal.active {
  opacity: 1;
}
.active.fade-bottom {
  animation: fade-bottom 1s ease-in-out;
}

@keyframes fade-bottom {
  0% {
    transform: translateY(50px);
    opacity: 0;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 1000px) {
  * {
    box-sizing: border-box;
  }
  .rocket {
    height: 460px;
    left: 90%;
    transform: translateX(-90%);
  }
  .main-text {
    top: 46%;
  }
  .about {
    width: 90%;
    border-radius: 10px;
  }
  .about-text {
    width: 400px;
  }
}
@media (max-width: 1140px) {
  .content {
    width: 100%;
  }
  .rocket {
    height: 438px;
  }
  .main-text,
  .rocket {
    margin: 10px;
  }
  .main-text h1 {
    font-size: 3rem;
  }
}
@media (max-width: 900px) {
  nav {
    justify-content: space-between;
    height: 65px;
    padding: 0px 30px;
  }
  .logo {
    height: 35px;
  }
  .menu {
    display: none;
    position: absolute;
    top: 65px;
    left: 0px;
    background-color: #301934;
    border-bottom: 1px solid rgba(85, 60, 154, 0.1);
    width: 100%;
    padding: 0px;
    margin: 0px;
  }
  .menu li {
    width: 100%;
  }
  nav .menu li a {
    width: 100%;
    height: 40px;
    justify-content: center;
    align-items: center;
    margin: 0px;
    padding: 25px;
    border: 1px solid rgba(38, 38, 38, 0.03);
  }
  nav .menu-icon {
    cursor: pointer;
    float: right;
    padding: 28px 20px;
    position: relative;
    user-select: none;
  }
  nav .menu-icon .nav-icon {
    background-color: #b393d3;
    display: block;
    height: 2px;
    position: relative;
    transition: background 0.2s ease-out;
    width: 18px;
  }
  nav .menu-icon .nav-icon::before,
  nav .menu-icon .nav-icon::after {
    background: #b393d3;
    content: "";
    display: block;
    height: 100%;
    position: absolute;
    transition: all ease-out 0.2s;
    width: 100%;
  }
  nav .menu-icon .nav-icon:before {
    top: 5px;
  }
  nav .menu-icon,
  .nav-icon:after {
    top: -5px;
  }
  nav .menu-btn:checked ~ .menu-icon .nav-icon {
    background: transparent;
  }
  nav .menu-btn:checked ~ .menu-icon .nav-icon:before {
    transform: rotate(-45deg);
    top: 0;
  }
  nav .menu-btn:checked ~ .menu-icon .nav-icon:after {
    transform: rotate(45deg);
    top: 0;
  }
  nav .menu-btn {
    display: none;
  }
  nav .menu-btn:checked ~ .menu {
    display: block;
  }
  .rocket {
    display: none;
  }
}
@media (max-width: 750px) {
  .rocket {
    display: none;
  }
  .about {
    top: 0px;
    margin-top: 0;
    flex-direction: column;
    width: 90%;
    height: auto;
    padding: 30px 0px;
    align-items: center;
  }
  .about-text {
    width: 90%;
  }
}
@media (max-width: 720px) {
  .rocket {
    display: none;
  }
  .main-text {
    width: 70%;
    position: absolute;
    left: 50%;
    top: 60%;
    transform: translate(-50%, -50%);
  }
}
!

JS 

              
                    function reveal() {
      var reveals = document.querySelectorAll(".reveal");

      for (var i = 0; i < reveals.length; i++) {
        var windowHeight = window.innerHeight;
        var elementTop = reveals[i].getBoundingClientRect().top;
        var elementVisible = 150;

        if (elementTop < windowHeight - elementVisible) {
          reveals[i].classList.add("active");
        } else {
          reveals[i].classList.remove("active");
        }
      }
    }

    window.addEventListener("scroll", reveal);
!
999px

Console