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CSS

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HTML 

              
                <header>
  <a href="#" class="logo">Food<span>.</span>v</a>
  <ul class="navigation">
    <li><a href="#banner">Home</a></li>
    <li><a href="#about">About</a></li>
    <li><a href="#menu">Menu</a></li>
    <li><a href="#expert">Expert</a></li>
    <li><a href="#testimonials">Testimonials</a></li>
    <li><a href="#contact">Contact</a></li>
  </ul>

  <div class="burger">
    <div class="line1"></div>
    <div class="line2"></div>
    <div class="line3"></div>
  </div>
</header>

<section class="contact" id="contact">
  <div class="title">
    <h2 class="titleText"><span>C</span>contact Us</h2>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
  </div>
  <div class="contactForm">
    <h3>Send Message</h3>

    <div class="inputBox">
      <input type="text" placeholder="Name">
    </div>
    <div class="inputBox">
      <input type="text" placeholder="Email">
    </div>
    <div class="inputBox">
      <textarea placeholder="Name"></textarea>
    </div>
    <div class="inputBox">
      <input type="submit" value="Send">
    </div>

  </div>
</section>

<div class="copyrightText">
  <p>Copyright 2021 <a href="#">Online Tutorials</a>.All right Reserved</p>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Poppins:200,300,400,500,600,700,800,900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
  scroll-behavior: smooth;
}

p {
  font-weight: 300;
  color: #111;
}

/* body
{
  min-height: 1000px;
} */

.banner {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  /* background-image: url("0.jpg"); */
  background-color: rgb(212, 205, 107);

  background-size: cover;
}

.banner .content {
  max-width: 900px;
  text-align: center;
}

.banner .content h2 {
  font-size: 4em;
  color: #fff;
}

.banner .content p {
  font-size: 1em;
  /* color: #fff; */
}

.btn {
  font-size: 1em;
  color: #fff;
  background: #ff0157;
  display: inline-block;
  padding: 10px 30px;
  margin-top: 20px;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 2px;
  transition: 0.5s;
}

.btn:hover {
  letter-spacing: 6px;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 40px 100px;
  z-index: 10000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.5s;
}

header.sticky {
  background: #fff;
  padding: 10px 100px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

header .logo {
  color: #fff;
  font-weight: 700;
  font-size: 2em;
  text-decoration: none;
}

header.sticky .logo {
  color: #111;
}

header .logo span {
  color: #ff0157;
}

header .navigation {
  position: relative;
  display: flex;
  /* background-color: pink; */
  justify-content: space-around;
}

header .navigation li {
  list-style: none;
  margin-left: 30px;
}

header .navigation li a {
  text-decoration: none;
  color: #fff;
  font-weight: 300;
}

header.sticky .navigation li a {
  color: #111;
}

header .navigation li a:hover {
  color: #ff0157;
}

section {
  padding: 100px;
}

.row {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: space-between;
}

.row .col50 {
  position: relative;
  width: 48%;
}

.titleText {
  color: #111;
  font-size: 2em;
  font-weight: 300;
}

.titleText span {
  color: #ff0157;
  font-weight: 700;
  font-size: 1.5em;
}

.row .col50 .imgBx {
  position: relative;
  width: 100%;
  /* min-height: 300px; */
  height: 100%;
}

.row .col50 .imgBx img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.title {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.menu .content {
  display: flex;
  justify-content: center;
  flex-direction: row-reverse;
  flex-wrap: wrap;
  margin-top: 40px;
}

.menu .content .box {
  width: 340px;
  margin: 20px;
  border: 15px solid #fff;
  box-shadow: 0 5px 35px rgba(0, 0, 0, 0.08);
}

.menu .content .box .imgBx {
  position: relative;
  width: 100%;
  height: 300px;
}

.menu .content .box .imgBx img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.menu .content .box .text {
  padding: 15px 0 5px;
}

.menu .content .box .text h3 {
  font-weight: 400;
  color: #111;
}

.expert .content {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  flex-direction: row;
  margin-top: 40px;
}

.expert .content .box {
  width: 250px;
  margin: 15px;
}

.expert .content .box .imgBx {
  position: relative;
  width: 100%;
  height: 300px;
}

.expert .content .box .imgBx img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.expert .content .box .text {
  padding: 15px 0 5px;
}

.expert .content .box .text h3 {
  font-weight: 400;
  color: #111;
}

.testimonials {
  background: url(co01.jpg);
  background-size: cover;
}

.white .titleText,
.white p {
  color: #fff;
}

.testimonials .content {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  flex-direction: row;
  margin-top: 40px;
}

.testimonials .content .box {
  width: 340px;
  margin: 20px;
  padding: 40px;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.testimonials .content .box .imgBx {
  position: relative;
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  border-radius: 50%;
  overflow: hidden;
}

.testimonials .content .box .imgBx img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonials .content .box .text {
  text-align: center;
}

.testimonials .content .box .text p {
  color: #666;
  font-style: italic;
}

.testimonials .content .box .text h3 {
  margin-top: 20px;
  color: #111;
  font-size: 1em;
  color: #ff0157;
  font-weight: 600;
}

.contact {
  background: url(img15.jpg);
  background-size: cover;
}

.contactForm {
  position: relative;
  left: -50px;
  padding: 75px 50px;
  background: #fff;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.1);
  max-width: 500px;
  margin-top: 50px;
}

.contactForm h3 {
  color: #111;
  font-size: 1.2em;
  margin-bottom: 20px;
  font-weight: 500;
}

.contactForm .inputBox {
  position: relative;
  width: 100%;
  margin-bottom: 20px;
}

.contactForm .inputBox input,
.contactForm .inputBox textarea {
  width: 100%;
  border: 1px sold #555;
  padding: 10px;
  color: #111;
  outline: none;
  font-size: 16px;
  font-weight: 300;
  resize: none;
}

.contactForm .inputBox input[type="submit"] {
  font-size: 1em;
  color: #fff;
  background: #ff0157;
  display: inline-block;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 2px;
  transition: 0.5s;
  max-width: 100px;
  font-weight: 500;
  border: none;
  cursor: pointer;

  box-shadow: 0 5px #970707;
}

.copyrightText {
  padding: 8px 40px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  text-align: center;
}

.copyrightText p {
  color: #ff0157;
  font-weight: 500;
  text-decoration: none;
}

.contactForm .inputBox input[type="submit"]:active {
  box-shadow: none;
  position: relative;
  top: 5px;
}

/* ====================== */
.burger{
  cursor: pointer;
  display: none;
}
 .burger div {
  width: 25px;
  height: 3px;
  background-color: rgb(161, 12, 12);
  margin: 5px;
}

.navigation-active {
  transform: translateX(0%)!important;
}

/* 以下追加 */
.navigation + .burger > div {
  transition: 0.5s;
}

.navigation-active + .burger > .line2 {
  opacity: 0;
}
.navigation-active + .burger > .line1 {
  transform: translatey(8px) rotate(45deg);
}
.navigation-active + .burger > .line3 {
  transform:  translatey(-8px) rotate(-45deg);
}
/* ここまで */

@media screen and (max-width: 1024px) {
.navigation {
    width: 75%;
  }
}


@media screen and (max-width: 768px) {
  body {
    overflow-x: hidden;
  }
    ul.navigation  { /* 修正 */
    position: absolute;
    right: 0;
    height: 92vh;
    top: 8vh;
    background-color: rgb(133, 133, 210);
    flex-direction: column;
    align-items: center;
    width: 50%;
    transform: translateX(100%);
    transition: 0.5s; /* 追加 */
  }
  header.sticky ul.navigation li a { /* 修正 */
    color: rgb(232, 209, 209);
  }

  .burger {
    display: block;
  }

    /*  .navigation li {
  opacity: 0; 
  } */
}
!

JS 

              
                window.addEventListener("scroll", function () {
  const header = document.querySelector("header");
  header.classList.toggle("sticky", window.scrollY > 0);
});
const burger = document.querySelector(".burger")
const navigation = document.querySelector(".navigation")

burger.addEventListener("click", () =>  {
    navigation.classList.toggle("navigation-active");
});
!
999px

Console