body {
    top: 0;
    left: 0;
    position: relative;
    transition: top .3s, left .3s;
}

body::after {
    content: "";
    position: fixed;
    top: 0;
    right: 6px;
    width: 50px;
    height: 50px;
    z-index: 10;
    background: url(/assets/img/hamburger.svg) no-repeat;
    cursor: pointer;
}

body:focus {
    top: 100px;
    left: -300px;
    overflow: hidden;
}

body:focus::after {
    background: url(/assets/img/cross.svg) no-repeat;
    pointer-events: none;
}

footer ul {
    flex-direction: column;
}

nav ul {
    top: 0;
    left: 0;
    position: fixed;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    pointer-events: none;
    font-size: 2.4rem;
}

nav ul li {
    transition: width .3s, text-indent .3s;
    overflow: hidden;
    width: 0px;
    text-align: right;
    text-indent: -300px;
    pointer-events: all;
}

nav ul li a {
    display: inline-block;
    margin: 8px 32px;
}

body:focus nav ul li {
    width: 300px;
    text-indent: 0px;
}

nav ul li:first-of-type a::before {
    position: fixed;
    transition: top .3s, left .3s;
}

body:focus nav::before {
    top: 0px;
    left: -300px;
}

body:focus nav ul li:first-of-type a::before {
    top: 100px;
    left: -284px;
}