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CSS

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HTML 

              
                <!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>Document</title>
</head>
<body>
	<div class="header">
		Header Title
		<button>menu<span></span></button>
	</div>
	<div class="tab" id="tab">
		<ul>
			<li><a href="">About</a></li>
			<li><a href="">V</a></li>
			<li><a href="">O</a>
				<ul class="sub_tab">
					<li><a href="#">미션영상 더보기</a></li>
				</ul>
			</li>
			<li><a href="">D</a></li>
			<li><a href="">Support</a></li>
		</ul>
		<button class="close">Close</button>
	</div>	
	
	<div class="container">
		Lorem ipsum dolor sit amet consectetur adipisicing elit. Placeat, minima error debitis reiciendis laudantium modi in dignissimos quos sapiente reprehenderit hic minus est, veritatis facere, asperiores ullam beatae? Dolor quae quisquam, voluptatum maxime, delectus id soluta modi ex, ipsa nemo itaque nostrum illum. Odit vitae illo ducimus pariatur officia, molestias nesciunt quasi fuga perspiciatis quaerat minima magni accusantium commodi quia obcaecati aspernatur. Voluptas molestias placeat distinctio error, assumenda sapiente dolorum at ipsa libero a sunt saepe voluptates beatae aliquam incidunt rem officia adipisci fugiat doloribus, sit quaerat consequuntur illum? Ea minima expedita facilis reprehenderit saepe, exercitationem alias praesentium esse laudantium sit consequatur! Delectus quam obcaecati atque! Nesciunt aliquid quae animi voluptates molestias dignissimos? Iure soluta dolorem magni culpa deserunt, tenetur nostrum aut nihil possimus aperiam ducimus dolorum architecto vitae distinctio ea amet neque non perspiciatis. Accusamus vero nostrum adipisci debitis maxime odio iusto vel culpa iure fugiat sunt, ducimus reprehenderit?
	</div>
	<div class="dim"></div>
</body>
</html>
!

CSS 

              
                // color set
$header-color : #ff7979;
$menu-color : #eb4d4b;
$container-color : #dff9fb;
$tab-color : #badc58;
$drag-background : #f6e58d;
$drag-color : #30336b;

a {
	text-decoration:none;
}
button {
	cursor:pointer;
	border:none;
	outline:none;
	background-color:transparent;
}
.header {
	width:100%;
	height:150px;
	text-align:center;
	line-height:150px;
	color:darken($header-color, 40%);
	background-color:$header-color;
	
	button {
		display:none;
	}

}

.tab {
	position:relative;
	width:100%;
	z-index:20;
	
	ul {
		width:100%;
		height:100%;
		display:table;
		table-layout:fixed;
		background:$tab-color;
		li {
			display:table-cell;
			text-align:center;   

			a {
				display:block;
				padding:20px;
				color:darken($tab-color, 70%);
				background-color:$tab-color;				
				transition:all .1s;
				&:hover {
					color:#fff;;
					background-color:darken($tab-color,20%);
				}
			}
			
			.sub_tab {
				display:none;
			}
		}
	}
	.close {
		display:none;
	}
}

.container {
	height:4000px;
	background-color:$container-color;
	line-height:1.5;
}

.if_fixed_container {
	padding-top:56px;
}

.fixed {
	position:fixed;
	left:0;
	right:0;
	top:0;
}

.dim {
	display:none;
	position:fixed;
	left:0;
	top:0;
	bottom:0;
	right:0;
	width:100%;
	height:100%;
	background:rgba(0,0,0,.5);
	z-index:10;
	&.dim_show{
		display:block;
	}
}
@media only screen
and (max-width : 897px) {
	.header {
		height:50px;
		line-height:50px;
		position:fixed;
		button {
			display:block;
			width:50px;
			height:50px;			
			position:absolute;
			left:0;
			top:0;
			font:0/0 a;
			transition:all .2s;
			&:hover {
				background-color:$menu-color;
			}
			span {
				display:block;
				content:"";
				width:25px;
				height:2px;
				position:absolute;
				left:0;
				right:0;
				bottom:0;
				top:0;
				margin:auto;
				background-color:#fff;
				border-radius:2px;
				&:before, 
				&:after {
					display:block;
					content:"";
					width:25px;
					height:2px;
					position:absolute;
					left:0;
					right:0;
					margin:auto;
					background-color:#fff;
					border-radius:2px;
				}
				
				&:before {
					top:-8px;
				}
				
				&:after {
					top:8px;
				}
			}
		}
	}
	
	.tab {		
		position:fixed;
		top:0;
		left:-90%;
		bottom:0;
		width:90%;		
		&.show {
			left:0;
		}
		ul {			
			display:block;
			padding-top:50px;
			li {
				display:block;
				text-align:left;				
				a {

				}				
				.sub_tab {
					display:block;
					padding-top:0;
					li {
						a {
							position:relative;
							padding:10px 20px 10px 30px;
							font-size:14px;
							&:before {
								display:inline-block;
								content:"\2517";
							}
						}
					}
				}
			}
		}
		
		.close {
			display:block;
			width:50px;
			height:50px;			
			position:absolute;
			right:0;
			top:0;
			border:none;
			outline:none;
			font:0/0 a;
			background:transparent;
			transition:all .2s;
			&:before {
				display:block;
				position:absolute;
				left:13px;
				top:24px;
				content: "\00d7";
				font-size:40px;
				color:darken($tab-color, 20%);
			}
			&:hover {
				background-color:darken($tab-color,20%);
				&:before {
					color:#fff;
				}
			}
		}
	}
	
}
 

// for drag color
::-moz-selection {
   background-color: $drag-background;
   color: $drag-color;
}
::selection {
    background-color: $drag-background;
    color: $drag-color;
}
!

JS 

              
                window.onscroll = function() {
 fix_func()
};

const passed =  document.getElementById('tab');
const nav_fix = passed.offsetTop;
const tab = document.querySelector('.tab');
const container = document.querySelector('.container');


function fix_func() {
 if (window.pageYOffset > nav_fix){  
	 tab.classList.add('fixed');	
	 container.classList.add('if_fixed_container');
 }else {	
	 tab.classList.remove('fixed');  
	 container.classList.remove('if_fixed_container');
 }
}

const menuButton = document.querySelector('button');
const mobileMenu = document.querySelector('.tab');
const mobileMenuClose = document.querySelector('.close');
const dim = document.querySelector('.dim');

function showMenu() {
	mobileMenu.style.transition = "all .2s";  
	mobileMenu.classList.add('show');
	dim.classList.add('dim_show');
}

function hideMenu() {
	mobileMenu.style.transition = "all .2s";  
	mobileMenu.classList.remove('show');
	dim.classList.remove('dim_show');
}

menuButton.addEventListener('click', showMenu);
mobileMenuClose.addEventListener('click', hideMenu);
dim.addEventListener('click', hideMenu);
!
999px

Console