.menu-icon {
    width: 24px;
    height: 24px;
    position: relative;
    margin: 0px;
    -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;
}
 .menu-icon span {
        display: block;
        position: absolute;
        height: 3px;
        width: 100%;
        border-radius: 9px;
        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;
    }

    .menu-icon span {
        background: #ffffff;
    }

        .menu-icon span:nth-child(1) {
            top: 2px;
            -webkit-transform-origin: left center;
            -moz-transform-origin: left center;
            -o-transform-origin: left center;
            transform-origin: left center;
        }

        .menu-icon span:nth-child(2) {
            top: 10px;
            -webkit-transform-origin: left center;
            -moz-transform-origin: left center;
            -o-transform-origin: left center;
            transform-origin: left center;
        }

        .menu-icon span:nth-child(3) {
            top: 18px;
            -webkit-transform-origin: left center;
            -moz-transform-origin: left center;
            -o-transform-origin: left center;
            transform-origin: left center;
        }

    .menu-icon.open span:nth-child(1) {
        -webkit-transform: rotate(45deg);
        -moz-transform: rotate(45deg);
        -o-transform: rotate(45deg);
        transform: rotate(45deg);
        top: 2px;
        left: 4px;
    }

 .menu-icon.open span:nth-child(2) {
        width: 0%;
        opacity: 0;
    }

    .menu-icon.open span:nth-child(3) {
        -webkit-transform: rotate(-45deg);
        -moz-transform: rotate(-45deg);
        -o-transform: rotate(-45deg);
        transform: rotate(-45deg);
        top: 19px;
        left: 4px;
    }