@media only all and (max-width: 991px) {
  .outer-menu {
    position: fixed;
    top: 10vh;
    left: 0;
    z-index: 1;
  }
  .menu-open .outer-menu .menu {
    pointer-events: auto;
    visibility: visible;
  }
  .menu-open .outer-menu .menu > div {
    transform: scale(1);
    transition-duration: .75s;
  }
  .menu-open .outer-menu .menu > div > div{
    opacity: 1;
    transition: opacity .2s ease .2s;
  }
  .outer-menu .menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      visibility: hidden;
      overflow: hidden;
      backface-visibility: hidden;
      outline: 1px solid transparent;
      display: flex;
      align-items: center;
      justify-content: center;
  }
  .outer-menu .menu > div {
      width: 200vw;
      height: 200vw;
      color: #fff;
      background: #000;
      border-radius: 50%;
      transition: all .2s ease;
      flex: none;
      transform: scale(0);
      backface-visibility: hidden;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
  }
  .outer-menu .menu > div > div {
    text-align: center;
    max-width: 90vw;
    max-height: 100vh;
    opacity: 0;
    transition: opacity .2s ease;
    overflow-y: auto;
    flex: none;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .outer-menu .menu > div > div > ul {
    list-style: none;
    padding: 0 1em;
    margin: 0;
    display: block;
    max-height: 100vh;
  }
  .outer-menu .menu > div > div > ul li {
    padding: 0;
    margin: 1em;
    font-size: 20px;
    display: block;
  }
  .outer-menu .menu > div > div > ul li a {
    color: #fff;
    font-weight: 600;
    padding: 0;
  }
}