.button_container {
        position: absolute;
        /* top:90px; */
        top: 45px;
        right:20px;
        height: 27px;
        width:40px;
        cursor: pointer;
        z-index: 100;
        -webkit-transition: opacity .25s ease;
        transition: opacity .25s ease;
        -webkit-transition: all 0.3s ease;
        -moz-transition: all 0.3s ease;
        -o-transition: all 0.3s ease;
        transition: all 0.3s ease;
        }

        .button_container:hover {
        opacity: .7;
        }
        .button_container.active .top {
        -webkit-transform: translateY(10px) translateX(0) rotate(45deg);
                transform: translateY(10px) translateX(0) rotate(45deg);
        background: #FFF;
        }
        .button_container.active .middle {
        opacity: 0;
        background: #FFF;
        }
        .button_container.active .bottom {
        -webkit-transform: translateY(-10px) translateX(0) rotate(-45deg);
                transform: translateY(-10px) translateX(0) rotate(-45deg);
        background: #FFF;
        }
        .button_container span {
        background: #fff;
        border: none;
        height:4px;
        border-radius:10px;
        width: 100%;
        position: absolute;
        top: 0px;
        left: 0;
        -webkit-transition: all .35s ease;
        transition: all .35s ease;
        cursor: pointer;
        }
        .button_container span:nth-of-type(2) {
        top: 10px;
        }
        .button_container span:nth-of-type(3) {
        top: 20px;
        }

        .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 1;
        visibility: hidden;
        -webkit-transition: opacity .35s, visibility .35s, width .35s;
        transition: opacity .35s, visibility .35s, width .35s;
        z-index: 50;
        }
        .overlay:before {
        content: '';
        background: #000;
        left: -55%;
        top: 0;
        width: 50%;
        height: 100%;
        position: absolute;
        -webkit-transition: left .35s ease;
        transition: left .35s ease;
        }
        .overlay:after {
        content: '';
        background:#000;
        right: -55%;
        top: 0;
        width: 50%;
        height: 100%;
        position: absolute;
        -webkit-transition: all .35s ease;
        transition: all .35s ease;
        }
        .overlay.open {
        opacity: .9;
        visibility: visible;
        height: 100%;
        }
        .overlay.open:before {
        left: 0;
        }
        .overlay.open:after {
        right: 0;
        }
        .overlay.open li {
        -webkit-animation: fadeInRight .5s ease forwards;
                animation: fadeInRight .5s ease forwards;
        -webkit-animation-delay: .05s;
                animation-delay: .05s;
        }
        .overlay.open li:nth-of-type(2) {
        -webkit-animation-delay: .15s;
                animation-delay: .15s;
        }
        .overlay.open li:nth-of-type(3) {
        -webkit-animation-delay: .35s;
                animation-delay: .35s;
        }
        .overlay.open li:nth-of-type(4) {
        -webkit-animation-delay: .55s;
                animation-delay: .55s;
        }
        .overlay.open li:nth-of-type(5) {
        -webkit-animation-delay: .75s;
                animation-delay: .75s;
        }
        .overlay.open li:nth-of-type(6) {
        -webkit-animation-delay: .95s;
                animation-delay: .95s;
        }
         .overlay.open li:nth-of-type(7) {
        -webkit-animation-delay: 1.05s;
                animation-delay: 1.05s;
        }
         .overlay.open li:nth-of-type(8) {
        -webkit-animation-delay: 1.25s;
                animation-delay: 1.25s;
        }
        .overlay nav {
        position: relative;
        height: 70%;
        top: 50%;
        padding-bottom:10px;
        -webkit-transform: translateY(-50%);
                transform: translateY(-50%);
        font-size: 20px;
        font-family: 'Lato', serif;
        font-weight: 400;
        text-align: center;
        z-index: 100;
        }
        .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% / 7);
        min-height: 50px;
        position: relative;
        opacity: 0;
        }
        .overlay ul li a {
        display: block;
        position: relative;
        color: #fff;
        text-decoration: none;
        font-family: 'Open Sans', sans-serif;
        
        }
        .overlay ul li a:hover:after,
        .overlay ul li a:focus:after,
        .overlay ul li a:active:after,
        .overlay ul li.ativo a:after,
        .overlay ul li.ativo a:after,
        .overlay ul li.ativo a:after
        {
            width: 100%;
        }
        .overlay ul li a:after {
        content: '';
        position: absolute;
        bottom:-8px;
        left: 50%;
        width: 0%;
        -webkit-transform: translateX(-50%);
                transform: translateX(-50%);
        height: 3px;
        background: #fff;
        -webkit-transition: .35s;
        transition: .35s;
        }

        @-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;
        }
    }