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Adding Classes

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CSS

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HTML 

              
                <nav>
    <div class="navbar">
      <div class='menu-btn' role="button">
        <div class="line"></div>
        <div class="line"></div>
        <div class="line"></div>
      </div>
      <div class="logo"><a href="https://html-plus.in.ua/" target="_blank">HTML+</a></div>
      <div class="nav-links">
        <div class="sidebar-menu">
          <span class="menu-name">
            <img src="https://html-plus.in.ua/wp-content/uploads/2018/10/logo.png" alt="Logo">
          </span>
          <span class='close-menu' role="button">&times;</span>
        </div>
        <ul class="links">
          <li><a href="https://html-plus.in.ua/">Главная</a></li>
          <li>
            <a href="https://html-plus.in.ua/html">HTML/CSS</a>
            <i class='arrow'></i>
            <ul class="sub-menu">
              <li><a href="https://html-plus.in.ua/category/html/bazovyy-html/">Базовый HTML</a></li>
              <li><a href="https://html-plus.in.ua/category/html/formy/">Формы</a></li>
              <li><a href="https://html-plus.in.ua/category/html/instrumenty-razrabotchika/">Инструменты разработчика</a></li>
              <li>
               <a href="#">CSS</a>
               <i class='arrow'></i>        
                <ul class="sub-menu">
                  <li><a href="https://html-plus.in.ua/category/menyu/">Меню</a></li>
                  <li><a href="https://html-plus.in.ua/category/css/css-animaciya/">CSS-анимация</a></li>
                  <li><a href="https://html-plus.in.ua/category/bootstrap/">Bootstrap</a></li>
                </ul>
              </li>
            </ul>
          </li>
          <li>
            <a href="https://html-plus.in.ua/category/javascript/">JavaScript</a>
            <i class='arrow'></i>
            <ul class="sub-menu">
              <li><a href="https://html-plus.in.ua/category/javascript/obrabotka-sobytiy/">Обработка событий</a></li>
              <li><a href="https://html-plus.in.ua/category/javascript/objects-classes/">Объекты, классы</a></li>
              <li><a href="https://html-plus.in.ua/category/javascript/es6/">ES6</a></li>
              <li><a href="https://html-plus.in.ua/category/jquery/">jQuery</a></li>
            </ul>
          </li>
          <li><a href="https://html-plus.in.ua/category/wordpress/">Wordpress</a></li>
          <li><a href="https://html-plus.in.ua/contacts/">Контакты</a></li>
        </ul>
      </div>
  
    </div>
  </nav>
!

CSS 

              
                *{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}
body{
  min-height: 100vh;
}
nav{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  height: 70px;
  background: #1E8CBE;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  z-index: 99;
}
nav .navbar{
  height: 100%;
  max-width: 1250px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: auto;
  /* background: red; */
  padding: 0 50px;
}
nav .logo a{
  font-size: 30px;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}
nav .nav-links{
  line-height: 70px;
  height: 100%;
}
nav .links{
  display: flex;
}
nav .links li{
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  padding: 0 14px;
}
nav .links li a{
  height: 100%;
  text-decoration: none;
  white-space: nowrap;
  color: #fff;
  font-size: 15px;
  font-weight: 500;
}
.links li:hover > .arrow{
  transform: rotate(180deg);
 }

nav .links li .arrow{
  background: url("data:image/svg+xml,%3C%3Fxml version='1.0' encoding='utf-8'%3F%3E%3Csvg viewBox='0 0 500 500' fill='white' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M 175.03 339.653 C 187.53 352.153 207.83 352.153 220.33 339.653 L 343.633 167.421 C 356.133 154.921 356.133 134.621 343.633 122.121 C 331.133 109.621 310.833 109.621 298.333 122.121 L 197.63 271.753 L 98.456 120.691 C 85.956 108.191 65.656 108.191 53.156 120.691 C 40.656 133.191 40.656 153.491 53.156 165.991 L 174.93 339.753 L 175.03 339.653 Z'/%3E%3C/svg%3E") no-repeat center/contain;
  height: 18px;
  width: 14px;
  line-height: 18px;
  text-align: center;
  display: inline-block;
  vertical-align: middle;
  color: #fff;
  margin-left: 4px;
  transition: all 0.3s ease;
}
nav .links li .sub-menu{
  position: absolute;
  top: 70px;
  left: 0;
  line-height: 40px;
  background: #1E8CBE;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  border-radius: 0 0 4px 4px;
  display: none;
  z-index: 2;
}
@media (min-width: 800.98px){
  nav .links li:hover > .sub-menu{
    display: block;
  }
  .links li .sub-menu li:hover .sub-menu{
    display: block;
  }
}
nav .links li .sub-menu li{
  padding: 0 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
nav .links li .sub-menu a {
  color: #fff;
  font-size: 15px;
  font-weight: 500;
}
nav .links li .sub-menu .arrow{
  transform: rotate(-90deg);
  margin-top: -2px;
}

nav .links li .sub-menu .sub-menu{
  position: absolute;
  top: 0;
  left: 100%;
  border-radius: 0 4px 4px 4px;
  z-index: 1;
  display: none;
}
nav .sidebar-menu{
  display: none;
}
nav .close-menu {
  font-size: 30px;
  font-weight: bold; 
  color: #fff;
  cursor: pointer;
  margin-top: -10px;
}
.menu-btn {
  display: none;
  width: 24px;
  height: 23px;
  cursor: pointer;
  margin-top: 5px;
}
.menu-btn .line {
  background-color: #fff;
  height: 2px;
  margin-bottom: 4px;
}

@media (max-width:920px) {
  nav .navbar{
    max-width: 100%;
    padding: 0 25px;
  }

  nav .navbar .logo a{
    font-size: 27px;
  }
  nav .links li{
    padding: 0 10px;
    white-space: nowrap;
  }
  nav .links li a{
    font-size: 15px;
  }
}
@media (max-width:800px){
  .navbar .menu-btn{
    display: inline-block;
  }
  nav .nav-links{
    position: fixed;
    top: 0;
    left: -100%;
    display: block;
    max-width: 290px;
    width: 100%;
    max-height: 100%;
    overflow-y: auto;
    background:  #1E8CBE;
    line-height: 40px;
    padding: 10px 20px;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.5s ease;
    z-index: 1000;
  }
  nav .sidebar-menu{
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .menu-name{
    font-size: 25px;
    color: #fff;
  }
  
  nav .links{
    display: block;
    margin-top: 20px;
  }
  nav .links li{
    display: block;
  }
  nav .links li .sub-menu, nav .links li .sub-menu .sub-menu{
    position: relative;
    top: 0;
    left: 0;
    padding: 0;
    box-shadow: none;
    display: none;
  }
  nav .links li .sub-menu li{
    border-bottom: none;
  }
  nav .links li.show > .sub-menu {
    display: block;
  }

  nav li.show  > .arrow {
    transform: rotate(180deg);
  }

}
@media (max-width:370px){
  nav .navbar .nav-links{
  max-width: 100%;
} 
}
!

JS 

              
                // search-box open close js code
let navbar = document.querySelector(".navbar");

// sidebar open close js code
let navLinks = document.querySelector(".nav-links");
let ulLinks = document.querySelector(".links");
let liSubmenu = document.querySelectorAll(".sub-menu");
let menuOpenBtn = document.querySelector("nav .menu-btn");
let menuCloseBtn = document.querySelector(".close-menu");
menuOpenBtn.onclick = function() {
navLinks.style.left = "0";
}
menuCloseBtn.onclick = function() {
navLinks.style.left = "-100%";
}
liSubmenu.forEach(item => item.parentNode.addEventListener('click', function(event){
  event.stopPropagation();
 this.classList.toggle('show');  
}))
!
999px

Console