<div class="menu">
	<h1>Title</h1>
    <input type="checkbox" id="menu">
    <label for="menu">
    	<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAMFBMVEUAAAD///////////////////////////////////////////////////////////87TQQwAAAAD3RSTlMAAQ8TFB4fSV6Ag4Wt6/uDY192AAAAQElEQVQoz2NgIAiEXVCAAsP5/yjgOwMq//8vdIHfDO9RBX4y9KEKXGOgCUCz5SqmOzBciuEXDN9ihAc1wGANZAAX+vf+Xu8gUwAAAABJRU5ErkJggg==" width="32" height="32" alt="">
    </label>
    <ul>
    	<li><a href="#">Home</a></li>
        <li>
            <ul>
            	<li><a href="#">Link 1</a></li>
                <li><a href="#">Link 2</a></li>
                <li>
                    <ul>
                    	<li>
                        	<ul>
                            	<li><a href="#">Link 1</a></li>
                                <li><a href="#">Link 2</a></li>
                                <li><a href="#">Link 3</a></li>
                            </ul>
                        	<a href="#">Links</a>
                        </li>
                    </ul>
                	<a href="#">Links</a>
                </li>
            </ul>
        	<a href="#">Links</a>
        </li>
        <li><a href="#">About</a></li>
    </ul>
</div>

html, body {
	font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
}
.menu {
	box-sizing: border-box;
    width: 100%;
    z-index: 9999;
    position: fixed;
    background-color: #394555;
}
.menu h1 {
	box-sizing: border-box;
    margin: 0;
    font-size: 26px;
    display: inline-block;
    float: left;
	line-height: 65px;
    padding: 0 80px 0 80px;
    color: #edf0f3;
}
.menu > ul {
	list-style-type: none;
    padding: 0;
    margin: 0;
    float: left;
}
.menu > ul ul {
	list-style-type: none;
	display: none;
    padding: 0;
    margin: 0;
    position: absolute;
    top: 100%;
}
.menu > ul > li {
	float: left;
    display: inline-block;
}
.menu > ul li li {
	position: relative;
}
.menu > ul > li:hover > ul {
	display: block;
}
.menu > ul > li > ul li:hover > ul {
	display: block;
    top: 0;
    left: 100%;
}
.menu a {
	display: block;
    padding: 25px 45px 25px 45px;
    background-color: #394555;
    box-sizing: border-box;
    text-decoration: none;
    color: #dadcdf;
    font-weight: bold;
    font-size: 14px;
    min-width: 150px;
    text-align: center;
}
.menu > ul > li > a {
	border-right: 1px solid #2b3543;
}
.menu > ul > li:first-child > a {
	border-left: 1px solid #2b3543;
}
.menu > ul > li > a:hover {
	background-color: #303a47;
}
.menu > ul ul li a {
	display: block;
    padding: 25px 45px 25px 45px;
    background-color: #29323d;
    box-sizing: border-box;
}
.menu > ul ul li a:hover {
	background-color: #1b2129;
}
.menu > ul ul ul ~ a::after {
	content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 15px;
    margin: auto;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 6px 0 6px 6px;
    border-color: transparent transparent transparent rgba(255,255,255,0.3);
}
.menu label,
.menu input {
	display: none;
}
@media screen and (max-width: 700px) {
	.menu ul {
    	display: none;
    }
    .menu label {
    	display: block;
        float: right;
        text-align: center;
        width: 40px;
        border-left: 1px solid #2b3543;
        padding: 15px 25px 15px 25px;
        opacity: 0.8;
    }
    .menu input:checked ~ ul {
    	display: block;
        top: 100%;
        position: absolute;
        width: 100%;
        height: calc(100vh - 100%);
        overflow-y: scroll;
        overflow-x: hidden;
    }
	.menu input:checked ~ ul li,
    .menu input:checked ~ ul ul,
    .menu input:checked ~ ul a {
    	position: static;
        display: block;
        width: 100%;
        top: 0;
        left: 0;
    }
    .menu input:checked ~ ul ul ul ~ a::after {
    	border: 0;
    }
    .menu a {
    	background-color: #29323d;
    }
}