HTMLify

body {
    margin: 0;
    padding: 0;
    background: #232323;
    color: #cdcdcd;
    font-family: "Barlow", sans-serif;
}

#menuToggle {
    display: block;
    position: relative;
    top: 50px;
    left: 50px;
    z-index: 1;
    user-select: none;
}

/* Input checkbox */
#menuToggle input {
    display: block;
    width: 40px;
    height: 32px;
    position: absolute;
    top: -7px;
    left: -6px;
    cursor: pointer;
    opacity: 0;
    /* hide this */
    z-index: 2;
    /* and place it over the hamburger */
}

/* Hamburger Icon */
#menuToggle span {
    display: block;
    width: 33px;
    height: 4px;
    margin-bottom: 5px;
    position: relative;
    background: #cdcdcd;
    border-radius: 3px;
    z-index: 1;
    transform-origin: 4px 0px;
    transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
        background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
        opacity 0.55s ease;
}

#menuToggle span:first-child {
    transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2) {
    transform-origin: 0% 100%;
}

/* Transforming hamburger into a crossmark */
#menuToggle input:checked~span {
    opacity: 1;
    transform: rotate(45deg) translate(-2px, -1px);
    background: #232323;
}

#menuToggle input:checked~span:nth-last-child(3) {
    opacity: 0;
    transform: rotate(0deg) scale(0.2, 0.2);
}

#menuToggle input:checked~span:nth-last-child(2) {
    transform: rotate(-45deg) translate(0, -1px);
}

/* Menu Container */
#menu {
    position: absolute;
    width: 100%;
    height: 100vh;
    margin: -100px 0 0 -50px;
    padding: 50px;
    padding-top: 125px;
    background: #ededed;
    list-style-type: none;
    transform-origin: 0% 0%;
    transform: translate(-100%, 0);
    transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0);
}

#menu li {
    padding: 10px 0;
    font-size: 30px;
    font-weight: 600;
    text-transform: uppercase;
    transition: font-size .2s ease-in-out;
}

/* Menu Links */
#menuToggle a {
    text-decoration: none;
    color: #232323;
    transition: color 0.3s ease;
}

#menuToggle a:hover li {
    font-size: 40px;
}

/* Sliding in the menu */
#menuToggle input:checked~ul {
    transform: none;
}