* {
    margin: 0;
    padding: 0; 
  }
  
  /* Icon 1 */
  
  #nav-icon1, #nav-icon2, #nav-icon3, #nav-icon4 {
    width: 30px;
    height: 30px;
    position: relative;
    margin: 0px auto;
    -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;
  }
  
  #nav-icon1 span, #nav-icon3 span, #nav-icon4 span {
    display: block;
    position: absolute;
    height: 5px;
    width: 100%;
    background: #fff;
    border-radius: 5px;
    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;
  }
  
  
  
  /* Icon 4 */
  
  #nav-icon4 {

  }
  
  #nav-icon4 span:nth-child(1) {
    top: 0px;
    -webkit-transform-origin: left center;
    -moz-transform-origin: left center;
    -o-transform-origin: left center;
    transform-origin: left center;
  }
  
  #nav-icon4 span:nth-child(2) {
    top: 12px;
    -webkit-transform-origin: left center;
    -moz-transform-origin: left center;
    -o-transform-origin: left center;
    transform-origin: left center;
  }
  
  #nav-icon4 span:nth-child(3) {
    top: 25px;
    -webkit-transform-origin: left center;
    -moz-transform-origin: left center;
    -o-transform-origin: left center;
    transform-origin: left center;
  }
  
  #nav-icon4.open span:nth-child(1) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    top: 0px;
    left: 5px;
  }
  
  #nav-icon4.open span:nth-child(2) {
    width: 0%;
    opacity: 0;
  }
  
  #nav-icon4.open span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    top: 21px;
    left: 5px;
  }