.burger {
    height: 3em;
    width: 3em;
    position: relative;
    z-index: 2;
    font-size: 10px;
    cursor: pointer;
    -webkit-transition: .8s all;
    -o-transition: .8s all;
    transition: .8s all;
    -webkit-tap-highlight-color: transparent; 
}
    .burger .burger-lines:after {
        left: 0;
        top: -1em; 
    }
    .burger .burger-lines:before {  
        left: 1em;
        top: 1em; 
    }
    .burger:after {
        content: '';
        display: block;
        position: absolute;
        height: 150%;
        width: 150%;
        top: -25%;
        left: -25%; 
    }
    .burger .burger-lines {
        top: 50%;
        margin-top: -0.125em; 
    }
    .burger .burger-lines, .burger .burger-lines:after, .burger .burger-lines:before {
        background-color: rgb(0, 46, 107);
        pointer-events: none;
        display: block;
        content: '';
        width: 100%;
        border-radius: 0.25em;
        height: 0.25em;
        position: absolute;
        -webkit-transform: rotate(0);
            -ms-transform: rotate(0);
                transform: rotate(0); 
    }
    .burger .burger-lines:after {
        left: 0;
        top: -1em; 
    }
    .burger .burger-lines:before {
        left: 1em;
        top: 1em; 
    }
    .burger.burger-rotate .burger-lines:after, .burger.burger-rotate .burger-lines:before {
        width: 2em; 
    }
    .burger.burger-rotate .burger-lines, .burger.burger-rotate .burger-lines:after, .burger.burger-rotate .burger-lines:before {
        -webkit-transition: all .2s;
        -o-transition: all .2s;
        transition: all .2s; 
    }
    .burger.burger-rotate.open {
        -webkit-transform: rotate(180deg);
        -ms-transform: rotate(180deg);
        transform: rotate(180deg); 
    }
    .burger.burger-rotate.open .burger-lines {
        background-color: transparent; 
    }
    .burger.burger-rotate.open .burger-lines:before, .burger.burger-rotate.open .burger-lines:after {
        background-color: rgb(250, 249, 221);
        left: 0.5em;
        top: 0px; 
    }
    .burger.burger-rotate.open .burger-lines:before {
        -webkit-transform: rotate(135deg);
        -ms-transform: rotate(135deg);
        transform: rotate(135deg); 
    }
    .burger.burger-rotate.open .burger-lines:after {
        -webkit-transform: rotate(-135deg);
        -ms-transform: rotate(-135deg);
        transform: rotate(-135deg); 
    }

.overlay {
    height: 100vh;
    width: 0;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    background-color: rgba(0,0,0, 0.9);
    overflow-x: hidden;
    -webkit-transition: 0.5s;
    transition: 0.5s;
    display: flex;
    justify-content: center;
    align-items: center;
}
    .overlay-content {
        display: flex;
        flex-direction: column;
        position: relative;
        overflow-x: hidden;
        opacity: 0;
    }
    .overlay a {
        text-decoration: none;
        -webkit-transition: 0.3s;
        transition: 0.3s;
        font-size: 60px;
        color: rgb(250, 249, 221);
        padding: 10px 0px 10px 0px;
    }