#ham {
    display: block;
    top: 1em;
    right: 2em;
    bottom: auto;
    position: fixed;
    padding:10px;
    -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:1000
}
#ham-inside {width:17px; height: 18px; position:relative; }
#ham span{
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: #000;
  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;
}
#ham.open span {background:white}

#ham span:nth-child(1) {
  top: 0px;
}

#ham span:nth-child(2),#ham span:nth-child(3) {
  top: 7px;
}

#ham span:nth-child(4) {
  top: 14px;
}

#ham.open span:nth-child(1) {
  top: 18px;
  width: 0%;
  left: 50%;
}

#ham.open span:nth-child(2) {
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}

#ham.open span:nth-child(3) {
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

#ham.open span:nth-child(4) {
  top: 18px;
  width: 0%;
  left: 50%;
}