.mainMenuContainer {
    position: relative;
    width: 100%;
    heigh: 100%;
    margin: 0 auto;
}


.mainMenuContainer a:hover:after, .mainMenuContainer a:focus:after, .mainMenuContainer a:active:after {
    width: 100%;
}

.button_container {
    position: absolute;
    top: 35px;
    right: 30px;
    height: 27px;
    width: 35px;
    cursor: pointer;
    z-index: 100;
    -webkit-transition: opacity .25s ease;
    transition: opacity .25s ease;
}

.button_container.active .top {
    -webkit-transform: translateY(11px) translateX(0) rotate(45deg);
    transform: translateY(11px) translateX(0) rotate(45deg);
    background: #FFF;
}
.button_container.active .middle {
    opacity: 0;
    background: #FFF;
}
.button_container.active .bottom {
    -webkit-transform: translateY(-11px) translateX(0) rotate(-45deg);
    transform: translateY(-11px) translateX(0) rotate(-45deg);
    background: #FFF;
}
.button_container span {
    background: #fff;
    border: none;
    height: 5px;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    -webkit-transition: all .35s ease;
    transition: all .35s ease;
    cursor: pointer;
}
.button_container span:nth-of-type(2) {
    top: 11px;
}
.button_container span:nth-of-type(3) {
    top: 22px;
}

.overlay {
    position: fixed;
    background: #002857;
    top: 0;
    left: 0;
    width: 100%;
    height: 0%;
    opacity: 0;
    visibility: hidden;
    -webkit-transition: opacity .35s, visibility .35s, height .35s;
    transition: opacity .35s, visibility .35s, height .35s;
    overflow: scroll;
}
.overlay.open {
    opacity: 1;
    visibility: visible;
    height: 100%;
    z-index: 3;
}
.overlay.open li {
    -webkit-animation: fadeInRight .5s ease forwards;
    animation: fadeInRight .5s ease forwards;
    -webkit-animation-delay: .35s;
    animation-delay: .35s;
}
.overlay.open li:nth-of-type(2) {
    -webkit-animation-delay: .4s;
    animation-delay: .4s;
}
.overlay.open li:nth-of-type(3) {
    -webkit-animation-delay: .45s;
    animation-delay: .45s;
}
.overlay.open li:nth-of-type(4) {
    -webkit-animation-delay: .50s;
    animation-delay: .50s;
}
.overlay nav {
    position: relative;
    height: 70%;
    top: 65%;
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
    font-size: 3.5rem;
    font-weight: 500;
    text-align: center;
}
.overlay ul {
    list-style: none;
    padding: 0;
    margin: 0 auto;
    display: inline-block;
    position: relative;
    height: 100%;
}
.overlay ul li {
    display: block;
    height: 25%;
    height: calc(100% / 6);
    min-height: 50px;
    position: relative;
    opacity: 0;
}
.overlay ul li a {
    display: block;
    position: relative;
    color: #FFF;
    text-decoration: none;
    overflow: hidden;
}
.overlay ul li a:hover:after, .overlay ul li a:focus:after, .overlay ul li a:active:after {
    width: 100%;
}


@-webkit-keyframes fadeInRight {
    0% {
        opacity: 0;
        left: 20%;
    }
    100% {
        opacity: 1;
        left: 0;
    }
}

@keyframes fadeInRight {
    0% {
        opacity: 0;
        left: 20%;
    }
    100% {
        opacity: 1;
        left: 0;
    }
}