#hamburger {
    top:10px; left: 10px;
    margin: 0; padding: 0;
    width: 40px;
    height: 45px;
    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;
    z-index: 10;
}

#hamburger span {
    display: block;
    position: absolute;
    height: 5px;
    width: 100%;
    background: #FFF;
    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;
}


#hamburger span:nth-child(1) { top: 0; }
#hamburger span:nth-child(2),#hamburger span:nth-child(3) { top: 15px; }
#hamburger span:nth-child(4) { top: 30px; }
#hamburger.open span:nth-child(1) { top: 18px; width: 0; left: 50%; }
#hamburger.open span:nth-child(2) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
}
#hamburger.open span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
}
#hamburger.open span:nth-child(4) { top: 18px; width: 0; left: 50%; }