* {
    margin: 0;
    padding: 0; 
  }
  
  /* Icon 1 */
  
  #mobile-nav {
    width: 60px;
    height: 30px;
    position: relative;
    margin: 21px 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;
    display: none;
  }

  @media (max-width: 991px) {
    #mobile-nav {
      display: block;
    }
  
    .navbar ul {
      display: none;
    }
  }
  
  #mobile-nav span {
    display: block;
    position: absolute;
    height: 3px;
    width: 80%;
    background: #d20000;
    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 */
  
  #mobile-nav {
  }
  
  #mobile-nav 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;
  }
  
  #mobile-nav 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;
  }
  
  #mobile-nav span:nth-child(3) {
    top: 24px;
    -webkit-transform-origin: left center;
    -moz-transform-origin: left center;
    -o-transform-origin: left center;
    transform-origin: left center;
  }
  
  #mobile-nav.open span:nth-child(1) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    top: -3px;
    left: 8px;
  }
  
  #mobile-nav.open span:nth-child(2) {
    width: 0%;
    opacity: 0;
  }
  
  #mobile-nav.open span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    top: 31px;
    left: 8px;
  }