<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    
    
 <link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:300,300i,400,400i,700i" rel="stylesheet">
    <style>
    
    
     * {
  box-sizing: border-box;
}
body {
  background-image: url(https://code.5g-o.com/wp-content/uploads/2020/11/shadow-bottom.png);
  min-height: 100vh;
  background: #8404fa;
  font-family: 'Roboto Condensed', sans-serif;
  color: white;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
   overflow: hidden;
            background-image:url(https://code.5g-o.com/wp-content/uploads/2020/10/67.jpeg);
            background-size: cover;
}
.header {
  position: fixed;
  z-index: 5;
  width: 100%;
}
.burger {
  position: absolute;
  z-index: 10;
  right: 25px;
  top: 25px;
  cursor: pointer;
  transform: rotateY(0);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.burger__patty {
  width: 28px;
  height: 2px;
  margin: 0 0 4px 0;
  background: white;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.burger__patty:last-child {
  margin-bottom: 0;
}
.burger--close {
  transform: rotate(180deg);
}
.burger--close .burger__patty:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}
.burger--close .burger__patty:nth-child(2) {
  opacity: 0;
}
.burger--close .burger__patty:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -4px);
}
.menu {
  position: fixed;
  top: 0;
  width: 100%;
  visibility: hidden;
}
.menu--active {
  visibility: visible;
}
.menu__brand, .menu__list {
  display: flex;
  flex-flow: column wrap;
  align-items: center;
  justify-content: center;
  float: left;
  width: 50%;
  height: 100vh;
  overflow: hidden;
    
}
.menu__list {
  margin: 0;
  padding: 0;
  background: #158cdf;
  list-style-type: none;
  transform: translate3d(0, -100%, 0);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.menu__list--active {
  transform: translate3d(0, 0, 0);
}
.menu__brand {
  background: #fff;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  transform: translate3d(0, 100%, 0);
}
.menu__brand--active {
  transform: translate3d(0, 0, 0);
}
.menu__item {
  transform: translate3d(500px, 0, 0);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.menu__item--active {
  transform: translate3d(0, 0, 0);
}
.menu__link {
  display: inline-block;
  position: relative;
  font-size: 30px;
  padding: 15px 0;
  font-weight: 300;
  color: white;
  text-decoration: none;
  color: white;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.menu__link:before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 10px;
  height: 2px;
  background: white;
  transform: translateX(-50%);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}
.menu__link:hover:before {
  width: 100%;
}
.menu .menu__item:nth-child(1) {
  transition-delay: 0.1s;
}
.menu .menu__item:nth-child(2) {
  transition-delay: 0.2s;
}
.menu .menu__item:nth-child(3) {
  transition-delay: 0.3s;
}
.menu .menu__item:nth-child(4) {
  transition-delay: 0.4s;
}
.menu .menu__item:nth-child(5) {
  transition-delay: 0.5s;
}
.menu .menu__item:nth-child(6) {
  transition-delay: 0.6s;
}
@media screen and (max-width: 768px) {
  ul.menu__list, div.menu__brand {
    float: none;
    width: 100%;
    min-height: 0;
  }
  ul.menu__list--active, div.menu__brand--active {
    transform: translate3d(0, 0, 0);
  }
  .menu__list {
    height: 75vh;
    transform: translate3d(-100%, 0, 0);
  }
  .menu__link {
    font-size: 24px;
  }
  .menu__brand {
    height: 25vh;
    transform: translate3d(100%, 0, 0);
       
  }
  .menu__brand .logo {
    width: 90px;
    height: 90px;
  }
}
.logo {
  width: 200px;
  height: 200px;
  background-image: url(owu.png);
    background-size: cover;
  border-radius: 50%;
}
h1, h2, h3, p {
  margin: 0;
  font-weight: 400;
}
main {
  height: 100vh;
  display: flex;
  flex-flow: column wrap;
  justify-content: center;
  padding: 8vw;
}
main h1 > a {
  color: white;
  text-decoration: none;
  font-size: 48px;
  font-weight: 300;
}
.support {
  position: fixed;
  bottom: 24px;
  color: rgba(0, 0, 0, 0.6);
}

    </style>
</head>
<body>
    <header class="header">
  <div class="burger">
    <div class="burger__patty"></div>
    <div class="burger__patty"></div>
    <div class="burger__patty"></div>
  </div>

  <nav class="menu">
    <div class="menu__brand">
      <a href=""><div class="logo"></div></a>
    </div>
    <ul class="menu__list">
      <li class="menu__item"><a href="" class="menu__link">HOME</a></li>
      <li class="menu__item"><a href="" class="menu__link">ABOUT</a></li>
      <li class="menu__item"><a href="" class="menu__link">GALLERY</a></li>
      <li class="menu__item"><a href="" class="menu__link">CONTACT</a></li>
      <li class="menu__item"><a href="" class="menu__link">LOCATIONS</a></li>
      <li class="menu__item"><a href="" class="menu__link">TESTIMONIALS</a></li>
      
       
    </ul>
  </nav>
</header>

<main>
  <h1><a href="http://ettrics.com" target="_blank">NAVBAR</a></h1>
  <h2>WITH CREATIVE SPLIT SCREEN USING HTML AND CSS 3</h2>
  
</main>
<script>
    (function() {
  
  var Menu = (function() {
    var burger = document.querySelector('.burger');
    var menu = document.querySelector('.menu');
    var menuList = document.querySelector('.menu__list');
    var brand = document.querySelector('.menu__brand');
    var menuItems = document.querySelectorAll('.menu__item');
    
    var active = false;
    
    var toggleMenu = function() {
      if (!active) {
        menu.classList.add('menu--active');
        menuList.classList.add('menu__list--active');
        brand.classList.add('menu__brand--active');
        burger.classList.add('burger--close');
        for (var i = 0, ii = menuItems.length; i < ii; i++) {
          menuItems[i].classList.add('menu__item--active');
        }
        
        active = true;
      } else {
        menu.classList.remove('menu--active');
        menuList.classList.remove('menu__list--active');
        brand.classList.remove('menu__brand--active');
        burger.classList.remove('burger--close');
        for (var i = 0, ii = menuItems.length; i < ii; i++) {
          menuItems[i].classList.remove('menu__item--active');
        }
        
        active = false;
      }
    };
    
    var bindActions = function() {
      burger.addEventListener('click', toggleMenu, false);
    };
    
    var init = function() {
      bindActions();
    };
    
    return {
      init: init
    };
    
  }());
  
  Menu.init();
  
}());
    
    
</script>
</body>
</html>

在线演示

让链接同时具备两种打开方式