style.css

html,body{
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
}

body{
    background: grey;

}

h1{
    position: absolute;
    top: 46%;
    left: 50%;
    transform: translate(-50%,-50%);
    color: #fff;
    font-size: 48px;
    font-family: sans-serif;
    font-weight: lighter;
}
.toggle-btn{
    position: fixed;
    margin: 1.4em;
    padding: 1em;
    width: 40px;
    height: 12px;
    right: 0;
    z-index: 1;
}

span.one{
    position: absolute;
    width: 40px;
    height: 2px;
    background: #fff;
}
span.two{
    position: absolute;
    width: 40px;
    height: 2px;
    background: #fff;
    margin-top: 12px;
}
.menu{
    z-index: 0;
    position: absolute;
    background: #101010;
    height: 100vh;
    width: 100%;
    top: -100%;
}

.data{
    padding: 8em 0 0 2em;
    text-align: left;

}

ul{
    list-style-type: none;

}

li:first-child{
    color: grey;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 24px;
}

li:not(:first-child){
    color: #fff;
    font-size: 42px;
}

a{
    text-decoration: none;
    color: #fff;
    font-family: arial;
}