* {
    margin: 0;
    padding: 0; 
  }
  
  /* Icon 1 */
  
  #nav-icon1, header .left .menu_btn, #nav-icon3, #nav-icon4 {
    width: 60px;
    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;
    scale: 0.5;
  }
  
  #nav-icon1 span, #nav-icon3 span, #nav-icon4 span {
    display: block;
    position: absolute;
    height: 9px;
    width: 100%;
    background: black;
    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;
  }
  
  #nav-icon1 span:nth-child(1) {
    top: 0px;
  }
  
  #nav-icon1 span:nth-child(2) {
    top: 18px;
  }
  
  #nav-icon1 span:nth-child(3) {
    top: 36px;
  }
  
  #nav-icon1.active span:nth-child(1) {
    top: 18px;
    -webkit-transform: rotate(135deg);
    -moz-transform: rotate(135deg);
    -o-transform: rotate(135deg);
    transform: rotate(135deg);
  }
  
  #nav-icon1.active span:nth-child(2) {
    opacity: 0;
    left: -60px;
  }
  
  #nav-icon1.active span:nth-child(3) {
    top: 18px;
    -webkit-transform: rotate(-135deg);
    -moz-transform: rotate(-135deg);
    -o-transform: rotate(-135deg);
    transform: rotate(-135deg);
  }
  
  /* Icon 2 */
  
  header .left .menu_btn span {
    display: block;
    position: absolute;
    height: 9px;
    width: 50%;
    background: black;
    opacity: 1;
    -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;
  }
  
  header .left .menu_btn span:nth-child(even) {
    left: 50%;
    border-radius: 0 9px 9px 0;
  }
  
  header .left .menu_btn span:nth-child(odd) {
    left:0px;
    border-radius: 9px 0 0 9px;
  }
  
  header .left .menu_btn span:nth-child(1), header .left .menu_btn span:nth-child(2) {
    top: 0px;
  }
  
  header .left .menu_btn span:nth-child(3), header .left .menu_btn span:nth-child(4) {
    top: 18px;
  }
  
  header .left .menu_btn span:nth-child(5), header .left .menu_btn span:nth-child(6) {
    top: 36px;
  }
  
  header .left .menu_btn.active span:nth-child(1),header .left .menu_btn.active span:nth-child(6) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }
  
  header .left .menu_btn.active span:nth-child(2),header .left .menu_btn.active span:nth-child(5) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }
  
  header .left .menu_btn.active span:nth-child(1) {
    left: 5px;
    top: 7px;
  }
  
  header .left .menu_btn.active span:nth-child(2) {
    left: calc(50% - 5px);
    top: 7px;
  }
  
  header .left .menu_btn.active span:nth-child(3) {
    left: -50%;
    opacity: 0;
  }
  
  header .left .menu_btn.active span:nth-child(4) {
    left: 100%;
    opacity: 0;
  }
  
  header .left .menu_btn.active span:nth-child(5) {
    left: 5px;
    top: 29px;
  }
  
  header .left .menu_btn.active span:nth-child(6) {
    left: calc(50% - 5px);
    top: 29px;
  }
  
  /* Icon 3 */
  
  #nav-icon3 span:nth-child(1) {
    top: 0px;
  }
  
  #nav-icon3 span:nth-child(2),#nav-icon3 span:nth-child(3) {
    top: 18px;
  }
  
  #nav-icon3 span:nth-child(4) {
    top: 36px;
  }
  
  #nav-icon3.active span:nth-child(1) {
    top: 18px;
    width: 0%;
    left: 50%;
  }
  
  #nav-icon3.active span:nth-child(2) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }
  
  #nav-icon3.active span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }
  
  #nav-icon3.active span:nth-child(4) {
    top: 18px;
    width: 0%;
    left: 50%;
  }
  
  /* Icon 4 */
  
  #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: 18px;
    -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: 36px;
    -webkit-transform-origin: left center;
    -moz-transform-origin: left center;
    -o-transform-origin: left center;
    transform-origin: left center;
  }
  
  #nav-icon4.active span:nth-child(1) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    top: -3px;
    left: 8px;
  }
  
  #nav-icon4.active span:nth-child(2) {
    width: 0%;
    opacity: 0;
  }
  
  #nav-icon4.active span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    top: 39px;
    left: 8px;
  }