.navbar-expand-md {
    z-index: 99;
    background: #000;
    padding: 0;
  }
  .navbar-expand-md .container .navbar-toggler {
    display: block;
  }
  
  .navbar-collapse {
    width: 100%;
    background: #000;
    position: fixed;
    z-index: 9;
    display: block;
    visibility: hidden;
    opacity: 0;
    z-index: -1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all 0.4s;
  }
  .navbar-collapse ul.navbar-nav {
    position: absolute;
    top: 100px;
    display: flex;
    align-items: center;
    justify-content: top;
    width: 100%;
    padding-top: 50px;
    padding-bottom: 50px;
    height: 100vh;
  }
  .navbar-collapse ul.navbar-nav li {
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.58, 0.3, 0.005, 1);
    padding: 0;
    margin-bottom: 20px;
  }
  .navbar-collapse ul.navbar-nav li a {
    color: #fff !important;
    font-size: 37px;
    padding: 0;
    font-weight: 400;

  }
  .navbar-collapse.show {
    min-height: 100vh;
    visibility: visible;
    opacity: 1;
    z-index: 9;
  }
  .navbar-collapse.show ul li {
    opacity: 1;
  }
  .navbar-collapse.show ul li:nth-child(1) {
    transition-delay: 0.06s;
  }
  .navbar-collapse.show ul li:nth-child(2) {
    transition-delay: 0.12s;
  }
  .navbar-collapse.show ul li:nth-child(3) {
    transition-delay: 0.18s;
  }
  .navbar-collapse.show ul li:nth-child(4) {
    transition-delay: 0.24s;
  }
  .navbar-collapse.show ul li:nth-child(5) {
    transition-delay: 0.3s;
  }
  .navbar-collapse.show ul li:nth-child(6) {
    transition-delay: 0.36s;
  }
  
  .navbar-toggler {
    padding: 0;
  }
  .navbar-toggler #nav-icon {
    width: 30px;
    height: 22px;
    position: relative;
    margin: 0 auto;
    transform: rotate(0deg);
    cursor: pointer;
  }
  .navbar-toggler #nav-icon span {
    display: block;
    position: absolute;
    height: 5px;
    width: 50%;
    background: #fff;
    opacity: 1;
    transform: rotate(0deg);
    transition: 0.25s ease-in-out;
  }
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(even) {
    left: 50%;
  }
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(odd) {
    left: 0px;
  }
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(1),
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(2) {
    top: 0px;
  }
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(3),
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(4) {
    top: 9px;
  }
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(5),
  .navbar-toggler[aria-expanded=false] #nav-icon span:nth-child(6) {
    top: 18px;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(1),
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(6) {
    transform: rotate(45deg);
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(2),
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(5) {
    transform: rotate(-45deg);
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(1) {
    left: 5px;
    top: 7px;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(2) {
    left: calc(50% - 5px);
    top: 7px;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(3) {
    left: -50%;
    opacity: 0;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(4) {
    left: 100%;
    opacity: 0;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(5) {
    left: 5px;
    top: 12px;
  }
  .navbar-toggler[aria-expanded=true] #nav-icon span:nth-child(6) {
    left: calc(50% - 5px);
    top: 12px;
  }