.hmbrgr {
    position: relative;
    display: inline-block;
}
.hmbrgr span {
    position: absolute;
    left: 0;
    width: 100%;
    background: #fff;
    display: inline-block;
}
.hmbrgr.expand span:nth-child(1) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    transform: rotate(-45deg);
}
.hmbrgr.expand span:nth-child(2) {
    -webkit-opacity: 0;
    -moz-opacity: 0;
    opacity: 0;
}
.hmbrgr.expand span:nth-child(3) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
}