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HTML 

              
                <html>
<head>
  <script src="https://webrazrab.ru/sitetemplate/jquery-2.2.4.min.js"></script>
</head>
<body>
 <span class="menu-toggle"><svg viewBox="0 0 448 512" width="100" title="bars">
  <path d="M16 132h416c8.837 0 16-7.163 16-16V76c0-8.837-7.163-16-16-16H16C7.163 60 0 67.163 0 76v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16z" />
</svg></span>
<nav id="top-menu" class="top-menu">
	<ul class="parent">
		<li><a href="#">Пункт 1</a>
			<span class="togg"></span>
			<div class="child">
				<ul>
					<li><a href="#">Подпункт 1</a></li>
					<li><a href="#">Подпункт 2</a></li>
					<li><a href="#">Подпункт 3</a></li>
				</ul>
			</div>
		</li>
		<li><a href="#">Пункт 2</a></li>
		<li><a href="#">Пункт 3</a>
			<span class="togg"></span>
			<div class="child">
				<ul>
					<li><a href="#">Подпункт 4</a></li>
					<li><a href="#">Подпункт 5</a></li>
					<li><a href="#">Подпункт 6</a></li>
					<li><a href="#">Подпункт 7</a></li>
					<li><a href="#">Подпункт 8</a></li>
				</ul>
			</div>
		</li>
		<li><a href="#">Пункт 4</a></li>
	</ul>
</nav>
  
</body>
</html>
!

CSS 

              
                body {background:url('https://webrazrab.ru/demo/tinyslider2/photos/4.jpg');background-size:cover;margin:0}
.top-menu {background:#fff}
.menu-toggle {display:none;}
.top-menu ul {
  list-style-type: none;
  padding-left: 0px;
  margin: 0px;
}
.top-menu ul li {position: relative;}
.top-menu .child {
  background: rgba(255, 255, 255, 0.4);
  border-radius:0px 0px 5px 5px;
  max-height: 0px;
  overflow: hidden;
  transition: all 0.5s ease 0s;
  -moz-transition: all 0.5s ease 0s;
  -webkit-transition: all 0.5s ease 0s;
  -o-transition: all 0.5s ease 0s;
}
.top-menu .child ul {
  background: rgba(255, 255, 255, 0.7);
  min-width: 220px;
  box-shadow: 0px 2px 5px #a7a7a7;
  border-radius: 0px 0px 5px 5px;
  margin:10px 4px 4px;
}
.top-menu a {
  display: block;
  padding: 5px 15px;color:#000;
  text-decoration:none;
}
.top-menu .togg {position: absolute;bottom: -8px;left: 50%;margin-left: -2px;}
.top-menu .togg:before {border-top: 4px solid #f44242;border-left: 4px solid transparent;border-right: 4px solid transparent;content: '';display: block;}
.top-menu .togg.active {transform: rotate(180deg);}
.togg, a, ul {transition: all 0.5s ease 0s;-moz-transition: all 0.5s ease 0s;-webkit-transition: all 0.5s ease 0s;-o-transition: all 0.5s ease 0s;}
@media (min-width: 992px) {
	.top-menu .parent > li {float: left;}
	.top-menu li:hover .child {max-height:1000px;}
	.top-menu ul:after {display:block;content:'';clear:both;}
	.top-menu .child {position: absolute;top: 100%;left: 0px;}
  .top-menu li > .togg:before {opacity:0.5}
	.top-menu li:hover > .togg {transform: rotate(180deg);z-index:10}
  .top-menu li:hover > .togg:before {opacity: 1;}
	.top-menu li:hover > a {color: #d60400}
}
@media (max-width: 991px) {
	.menu-toggle {display:block;}
  .menu-toggle svg {
    padding: 5px;background:rgba(255,255,255,0.5);
    border-radius: 5px;width: 40px;
  }
	.top-menu {display:none;position:absolute;height:80%;overflow:auto;left:0;right:0}
	body.menuopen {width: 100%;height: 100%;overflow: hidden;}
	.top-menu a {display:inline-block;}
	.top-menu .parent > li {
    border-bottom: 1px dotted #ccc;
    min-height: 36px;
    display: flex;flex-wrap:wrap;
    align-items: center;
  }
  .top-menu .child {width:100%}
	.top-menu .child.open {max-height:1000px}
	.top-menu .togg {
    height: 30px;width: 30px;
    top: 3px;border: 1px solid #5e5e5e;
    bottom: auto;right: 10px;left: auto;
    margin-left: 0px;padding: 10px 5px;
    box-sizing: border-box;border-radius: 30px;
  }
	.top-menu .togg:before {
    border-top: 10px solid #ec3437;
    border-left: 9px solid transparent;
    border-right: 9px solid transparent;
  }
}
!

JS 

              
                $(".menu-toggle").click(function () {
	$('#top-menu').toggle().toggleClass('open');
	$('body').toggleClass('menuopen')
});
$('.togg').click(function () {
    if ($(this).hasClass('active')) {
  $(this).removeClass('active').next().removeClass('open');
    } else {
        $(this).addClass('active').next().addClass('open');
    }
});
!
999px

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