.main-menu {
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
}

.nav-open .main-menu {
    opacity: 1;
    visibility: visible;
    background: rgba(0, 0, 0, 0.92);
}

.main-menu .nav li a {
    font-size: 5vh;
    font-weight: 600;
}

.main-menu .nav li {
    opacity: 0;
    -webkit-transform: translateY(-40px);
    transform: translateY(-40px);
    -webkit-animation-timing-function: cubic-bezier(.45, .005, 0, 1);
    -moz-animation-timing-function: cubic-bezier(.45, .005, 0, 1);
    -o-animation-timing-function: cubic-bezier(.45, .005, 0, 1);
    animation-timing-function: cubic-bezier(.45, .005, 0, 1);
}

.nav-open .main-menu .nav li {
    opacity: 1;
    -webkit-transform: translateY(0px);
    transform: translateY(0px);
    -webkit-transition: -webkit-transform .2s, opacity .2s;
    transition: transform .2s, opacity .2s;
}

/
/
TODO move delays out, add elsewhere ie sleader tables
.main-menu .nav li.delay-1 {
    -webkit-transition-delay: 0.1s;
    -moz-transition-delay: 0.1s;
    -ms-transition-delay: 0.1s;
    -o-transition-delay: 0.1s;
    transition-delay: 0.1s;
}

.main-menu .nav li.delay-2 {
    -webkit-transition-delay: 0.2s;
    -moz-transition-delay: 0.2s;
    -ms-transition-delay: 0.2s;
    -o-transition-delay: 0.2s;
    transition-delay: 0.2s;
}

.main-menu .nav li.delay-3 {
    -webkit-transition-delay: 0.3s;
    -moz-transition-delay: 0.3s;
    -ms-transition-delay: 0.3s;
    -o-transition-delay: 0.3s;
    transition-delay: 0.3s;
}

.main-menu .nav li.delay-4 {
    -webkit-transition-delay: 0.4s;
    -moz-transition-delay: 0.4s;
    -ms-transition-delay: 0.4s;
    -o-transition-delay: 0.4s;
    transition-delay: 0.4s;
}

.main-menu .nav li.delay-5 {
    -webkit-transition-delay: 0.5s;
    -moz-transition-delay: 0.5s;
    -ms-transition-delay: 0.5s;
    -o-transition-delay: 0.5s;
    transition-delay: 0.5s;
}

.main-menu .nav li.delay-6 {
    -webkit-transition-delay: 0.6s;
    -moz-transition-delay: 0.6s;
    -ms-transition-delay: 0.6s;
    -o-transition-delay: 0.6s;
    transition-delay: 0.6s;
}

.main-menu .nav li.delay-7 {
    -webkit-transition-delay: 0.7s;
    -moz-transition-delay: 0.7s;
    -ms-transition-delay: 0.7s;
    -o-transition-delay: 0.7s;
    transition-delay: 0.7s;
}

.main-menu .nav li.delay-8 {
    -webkit-transition-delay: 0.8s;
    -moz-transition-delay: 0.8s;
    -ms-transition-delay: 0.8s;
    -o-transition-delay: 0.8s;
    transition-delay: 0.8s;
}

.main-menu .nav li.delay-9 {
    -webkit-transition-delay: 0.9s;
    -moz-transition-delay: 0.9s;
    -ms-transition-delay: 0.9s;
    -o-transition-delay: 0.9s;
    transition-delay: 0.9s;
}

.nav-button {
    position: relative;
    z-index: 1111;
    height: 42px;
    display: block;
    width: 50px;
    padding: 12px;
}

.nav-button #nav-icon3 {
    width: 30px;
    height: 22px;
    display: inline-block;
    position: relative;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .5s ease-in-out;
    -moz-transition: .5s ease-in-out;
    -o-transition: .5s ease-in-out;
    transition: .5s ease-in-out;
    cursor: pointer;
}

.nav-button #nav-icon3 span {
    display: block;
    position: absolute;
    height: 5px;
    width: 100%;
    background: #20ff20;
    opacity: 1;
    left: 0;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .25s ease-in-out;
    -moz-transition: .25s ease-in-out;
    -o-transition: .25s ease-in-out;
    transition: .25s ease-in-out
}

.nav-button #nav-icon3 span:nth-child(1) {
    top: 0
}

.nav-button #nav-icon3 span:nth-child(2), #nav-icon3 span:nth-child(3) {
    top: 10px
}

.nav-button #nav-icon3 span:nth-child(4) {
    top: 20px
}

.nav-open #nav-icon3 span:nth-child(1) {
    top: 9px;
    width: 0;
    left: 50%
}

.nav-open #nav-icon3 span:nth-child(2) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg)
}

.nav-open #nav-icon3 span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg)
}

.nav-open #nav-icon3 span:nth-child(4) {
    top: 9px;
    width: 0;
    left: 50%
}

.flex-center {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    height: 100%
}