.menu-toggle {
    width: 40px;
    height: 30px;
    position: absolute;
    top: 40px;
    right: 40px;
    cursor: pointer;
}

.menu-toggle.on .one {
    -moz-transform: rotate(45deg) translate(7px, 7px);
    -ms-transform: rotate(45deg) translate(7px, 7px);
    -webkit-transform: rotate(45deg) translate(7px, 7px);
    transform: rotate(45deg) translate(7px, 7px);
}

.menu-toggle.on .two {
    opacity: 0;
}

.menu-toggle.on .three {
    -moz-transform: rotate(-45deg) translate(8px, -10px);
    -ms-transform: rotate(-45deg) translate(8px, -10px);
    -webkit-transform: rotate(-45deg) translate(8px, -10px);
    transform: rotate(-45deg) translate(8px, -10px);
}

.one, .two, .three {
    width: 100%;
    height: 5px;
    background: white;
    margin: 6px auto;
    backface-visibility: hidden;
    -moz-transition-duration: 0.3s;
    -o-transition-duration: 0.3s;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
}

nav ul {
    margin: 0;
    padding: 0;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-family: Open Sans;
    list-style: none;
    text-align: center;
    width: 100%;
}

nav ul.hidden {
    display: none;
}

nav ul a {
    /* -moz-transition-duration: 0.5s;
    -o-transition-duration: 0.5s;
    -webkit-transition-duration: 0.5s;
    transition-duration: 0.5s;
    text-decoration: none; */
    color: white;
    font-size: 3em;
    line-height: 1.5;
    width: 100%;
    display: block;
}

nav ul a:hover {
    color: rgb(0, 0, 0);
}

.menu-section.on {
    z-index: 10;
    width: 100%;
    height: 100%;
    display: block;
    background-color: rgba(0, 0, 0, 0.5);
    position: fixed;
}

.is-hidden {
    opacity: 0;
    transition: transform 0.4s, opacity 0.2s;
}

.is-visible {
    transition: transform 0.4s, opacity 0.2s;
}