<div class="menu_btn" role="button"><a href="#" title="open menu">menu</a></div>
        
        <nav class="navigation" role="navigation">
            <h2>main navigation</h2>
            <div class="panel panel--left">
                <ul class="menu">
                    <li><a href="#" title="drinks"><span class="litem">Drinks</span></a>
                        <i class="line"></i>
                    </li>
                    <li><a href="#" title="food"><span class="litem">food</span></a>
                        <ul class="sub-menu">
                            <li><a href="#" title="Breakfast"><span class="litem">Breakfast</span></a></li>
                            <li><a href="#" title="Lunch"><span class="litem">Lunch</span></a></li>
                            <li><a href="#" title="Dinner"><span class="litem">Dinner</span></a></li>
                        </ul>
                        <i class="line"></i>
                    </li>
                    <li><a href="#" title="coffee"><span class="litem">coffee</span></a>
                        <ul class="sub-menu">
                            <li><a href="#" title="Espresso"><span class="litem">Espresso</span></a></li>
                            <li><a href="#" title="Macchiato"><span class="litem">Macchiato</span></a></li>
                            <li><a href="#" title="Macchiato"><span class="litem">Macchiato</span></a></li>
                        </ul>
                        <i class="line"></i>
                    </li>
                    <li><a href="#" title="events"><span class="litem">events</span></a>
                        <i class="line"></i>
                    </li>
                    <li><a href="#" title="catalog"><span class="litem">catalog</span></a>
                        <i class="line"></i>
                    </li>
                </ul>
                <footer class="footer">
                    <span class="footer__gredits">developed by <a href="#" title="">vn</a></span>
                    <span class="footer__social"><a href="#" title="facebook">facebook</a> - <a href="#" title="instagram">instagram</a></span>
                </footer>
            </div>
            <div class="panel panel--right">
                <div class="close_btn"><a href="#">close</a></div>
                <div class="data">
                    <div class="data__content">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas egestas, nulla id tincidunt dignissim, magna magna imperdiet metus, vel porta enim metus ac justo. Nam aliquam est nec felis condimentum, sed rhoncus.</div>
                    <div class="data__sub">"Nvagelis"</div>
                </div>
            </div>	
        </nav>

$red: #e2001a;
$transition: ease-in-out .4s;
html {
    box-sizing: border-box;
}
*, *:before, *:after {
    box-sizing: inherit;
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
a {
  text-decoration: none;
}

body {
    font-family: open_sansregular,sans-serif;
    font-size: 100%;
    font-style: normal;
    text-transform: none;
    text-align: left;
    letter-spacing: normal;
    word-spacing: normal;
    line-height: 1.4;
    vertical-align: baseline;
    background-color: #292a2e;
    
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.menu_btn{
    position:relative;
    visibility: visible;
    opacity: 1;
    z-index: 20;
    a{
        font-size: 2em;
        padding: 20px 15px;
        display: inline-block;
        letter-spacing: 3px;
        transition: color $transition;
        color: #fff;
        &:hover,
        &:focus,
        &:focus-within{
            color: $red;
        }
        }
    
}
nav{
    display: block;
}


.panel{
    position: absolute;
    top: 0;
    width: 0;
    height: 100%;
    overflow: hidden;
    width: 0%;
    &--left {
        display: flex;
        flex-direction: column;
        align-items: center;
        
        background-color: #292b2f;
        right: 50%;
    }
    &--right {
        display: flex;
        align-items: center;
        justify-content: center;
    
        background-color: #2f3135;
        right: 0;
    }
}
.line {
    display: block;
    position: absolute;
    left: 0;
    top: 1em;
    width: 28px;
    height: 1px;
    background: rgba(130,130,130,.6);
    opacity: 0;
}
.navigation ul li, 
.navigation ul li a, 
.navigation ul li a span {
    position: relative;
    display: block;
}
.navigation {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    z-index: 10;
    h2 {
        width: 0;
        height: 0;
        text-indent: -9999px;
    }
    .menu{
        display: flex;
        flex: 8;
        flex-direction: column;
        justify-content: center;
        text-align: left;
        transform: translate(-100%, 0);
        >li{
            line-height: 30px;
            font-size: 20px;
            font-size: 1.25em;
            font-size: 1.25rem;
            padding: .4em 0 .4em 42px;
            margin: .2em 0;
            text-align: left;
            float: left;
            clear: both;
            >a{
                color: #fff;
                text-decoration: none;
                overflow: hidden;
                transition: color $transition;
                &:hover,
                &:focus,
                &:focus-within{
                    color: $red;
                }
                >span{
                    top: 0;
                    text-transform: capitalize;
                }
            }
        }
    }
    .sub-menu{
        >li{
            display: block;
            float: left;
            clear: both;
            line-height: 30px;
            font-size: 14px;
            font-size: .875em;
            font-size: .875rem;
            padding: 0;
            margin: 0;
            >a{
                color: #828282;
                text-transform: none;
                overflow: hidden;
                transition: color $transition;
                &:hover,
                &:focus,
                &:focus-within{
                    color: $red;
                }
            }
        }
    }
}
.litem{
    transform: translate(0, -100%);
}

.footer{
    display: flex;
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    padding: 32px 70px;
    
    opacity: 0;
    
    font-size: 12px;
    font-size: .75em;
    font-size: .75rem;
    &__gredits,
    &__social{
        display: block;
        color: #828282;
        >a{
            color: #828282;
            margin: 0 5px;
            text-decoration: none;
            transition: color $transition;
            &:hover,
            &:focus,
            &:focus-within{
                color: $red;
            }
        }
    }
}

.close_btn{
    position: absolute;
    top: 10px;
    right: 10px;
    a{
        font-size: 1em;
        padding: 20px 15px;
        display: inline-block;
        letter-spacing: 3px;
        transition: color $transition;
        color: #fff;
        &:hover,
        &:focus,
        &:focus-within{
            color: $red;
        }
    }
    
}

.data {
    padding: 0 20%;
    &__content{
        font-family: open_sansregular,arial;
        font-size: 26px;
        font-size: 1.625em;
        font-size: 1.625rem;
        line-height: 38px;
        color: #828282;
        font-style: italic;
        text-align: justify;
        opacity: 0;
        transform: translate(0, 50px);
        @media(max-width:680px){
            font-size: 16px;
            font-size: 1em;
            font-size: 1rem;
            line-height: 18px;
        }
    }
    &__sub{
        color: #fff;
        float: left;
        margin-top: 2%;
        font-size: 11px;
        font-size: .6875em;
        font-size: .6875rem;
        opacity: 0;
        transform: translate(0, 50px);
    }
}

$(document).ready(function (){
               
               var open_btn = $('.menu_btn');
               var close_btn = $('.close_btn');
               
               var panels = $('.panel');
               var links = $('.litem');
               var lines = $('.line');
               var data_content = $('.data__content');
               var data_sub = $('.data__sub');
               var footer = $('.footer');
               
               var tl = new TimelineLite({paused:true});
               
               tl.to(panels, 0.5, {width: '50%'})
                       .to(open_btn, 0.5, {opacity: 0, visibility: 'hidden', 'z-index':0}, "-=0.5")
                       .to(data_content, 0.5, {y:0, opacity: 1})
                       .to(data_sub, 0.5, {y:0, opacity: 1}, "-=0.25")
                       .staggerTo(links, 0.3, {y:0}, 0.05, "-=0.75")
                       .to(lines, 0.5, {opacity: 1})
                       .to(footer, 0.5, {opacity: 1}, "-=0.5");
               
               
               
               
               
               open_btn.on('click', function (e){
                   e.preventDefault();
                   tl.play();
               });
               
               close_btn.on('click', function (e){
                   e.preventDefault();
                   tl.reverse();
               });

            });